Rounded checkboxes in download prompt & page info window are glitched

### Describe the bug

I noticed, that the rounded checkboxes in the download prompt aren't showing as intended, because I believe, that they looked differently in past.

I guess, that Mozilla changed the appearance of both rounded & square checkboxes in some recent Firefox versions, but I'm not sure. If this theory is true, then that's the possible explanation for why `userChrome.rounding.square_checklabel` doesn't work either (as I reported in #905).

This is the actual appearance of the mentioned rounded checkboxes:

### Expected behavior

This is how they should look like (edited by Paint.net app):

### Screenshots

_No response_

### OS

Windows 10

### OS - Others

_No response_

### Firefox Version

v127.0.0 (64-bit)

### Distribution

- [X] [Original Lepton](https://github.com/black7375/Firefox-UI-Fix)
- [ ] [Lepton's photon style](https://github.com/black7375/Firefox-UI-Fix/tree/photon-style)
- [ ] [Lepton's proton style](https://github.com/black7375/Firefox-UI-Fix/tree/proton-style)

### Theme

- [X] Light
- [X] Dark
- [ ] Alpenglow (System: Light)
- [ ] Alpenglow (System: Dark)
- [ ] System Default
- [ ] Others: (e.g. [Photon Colors](https://addons.mozilla.org/en-US/firefox/addon/photon-colors/), [Google Chrome Dark](https://addons.mozilla.org/en-US/firefox/addon/google-chrome-dark/), [Fairytale Of Nature](https://addons.mozilla.org/en-US/firefox/addon/fairytale-of-nature/))

### Theme - More Info

_No response_

### `user.js` setup

user.js setup

```javascript
// ** Theme Default Options ****************************************************
// userchrome.css usercontent.css activate
user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true);

// Fill SVG Color
user_pref("svg.context-properties.content.enabled", true);

// Restore Compact Mode - 89 Above
user_pref("browser.compactmode.show", true);

// about:home Search Bar - 89 Above
user_pref("browser.newtabpage.activity-stream.improvesearch.handoffToAwesomebar", false);

// CSS's `:has()` selector #457 - 103 Above
user_pref("layout.css.has-selector.enabled", true);

// Browser Theme Based Scheme - Will be activate 95 Above
// user_pref("layout.css.prefers-color-scheme.content-override", 3);

// ** Theme Related Options ****************************************************
// == Theme Distribution Settings ==============================================
// The rows that are located continuously must be changed `true`/`false` explicitly because there is a collision.
// https://github.com/black7375/Firefox-UI-Fix/wiki/Options#important
user_pref("userChrome.tab.connect_to_window", true); // Original, Photon
user_pref("userChrome.tab.color_like_toolbar", true); // Original, Photon

user_pref("userChrome.tab.lepton_like_padding", true); // Original
user_pref("userChrome.tab.photon_like_padding", false); // Photon

user_pref("userChrome.tab.dynamic_separator", true); // Original, Proton
user_pref("userChrome.tab.static_separator", false); // Photon
user_pref("userChrome.tab.static_separator.selected_accent", false); // Just option
user_pref("userChrome.tab.bar_separator", false); // Just option

user_pref("userChrome.tab.newtab_button_like_tab", true); // Original
user_pref("userChrome.tab.newtab_button_smaller", false); // Photon
user_pref("userChrome.tab.newtab_button_proton", false); // Proton

user_pref("userChrome.icon.panel_full", true); // Original, Proton
user_pref("userChrome.icon.panel_photon", false); // Photon

// Original Only
user_pref("userChrome.tab.box_shadow", true);
user_pref("userChrome.tab.bottom_rounded_corner", true);

// Photon Only
user_pref("userChrome.tab.photon_like_contextline", false);
user_pref("userChrome.rounding.square_tab", false);

// == Theme Compatibility Settings =============================================
// user_pref("userChrome.compatibility.accent_color", true); // Firefox v103 Below
// user_pref("userChrome.compatibility.covered_header_image", true);
// user_pref("userChrome.compatibility.panel_cutoff", true);
// user_pref("userChrome.compatibility.navbar_top_border", true);
// user_pref("userChrome.compatibility.dynamic_separator", true); // Need dynamic_separator

// user_pref("userChrome.compatibility.os.linux_non_native_titlebar_button", true);
// user_pref("userChrome.compatibility.os.windows_maximized", true);
// user_pref("userChrome.compatibility.os.win11", true);

// == Theme Custom Settings ====================================================
// -- User Chrome --------------------------------------------------------------
// user_pref("userChrome.theme.private", true);
// user_pref("userChrome.theme.proton_color.dark_blue_accent", true);
// user_pref("userChrome.theme.monospace", true);
// user_pref("userChrome.theme.transparent.frame", true);
// user_pref("userChrome.theme.transparent.menu", true);
// user_pref("userChrome.theme.transparent.panel", true);
// user_pref("userChrome.theme.non_native_menu", true); // only for linux

// user_pref("userChrome.decoration.disable_panel_animate", true);
// user_pref("userChrome.decoration.disable_sidebar_animate", true);
// user_pref("userChrome.decoration.panel_button_separator", true);
// user_pref("userChrome.decoration.panel_arrow", true);

// user_pref("userChrome.autohide.tab", true);
// user_pref("userChrome.autohide.tab.opacity", true);
// user_pref("userChrome.autohide.tab.blur", true);
// user_pref("userChrome.autohide.tabbar", true);
// user_pref("userChrome.autohide.navbar", true);
// user_pref("userChrome.autohide.bookmarkbar", true);
// user_pref("userChrome.autohide.sidebar", true);
// user_pref("userChrome.autohide.fill_urlbar", true);
// user_pref("userChrome.autohide.back_button", true);
// user_pref("userChrome.autohide.forward_button", true);
// user_pref("userChrome.autohide.page_action", true);
// user_pref("userChrome.autohide.toolbar_overlap", true);
// user_pref("userChrome.autohide.toolbar_overlap.allow_layout_shift", true);

// user_pref("userChrome.hidden.tab_icon", true);
// user_pref("userChrome.hidden.tab_icon.always", true);
// user_pref("userChrome.hidden.tabbar", true);
// user_pref("userChrome.hidden.navbar", true);
// user_pref("userChrome.hidden.private_indicator", true);
// user_pref("userChrome.hidden.titlebar_container", true);
// user_pref("userChrome.hidden.sidebar_header", true);
// user_pref("userChrome.hidden.sidebar_header.vertical_tab_only", true);
// user_pref("userChrome.hidden.urlbar_iconbox", true);
// user_pref("userChrome.hidden.urlbar_iconbox.label_only", true);
// user_pref("userChrome.hidden.bookmarkbar_icon", true);
// user_pref("userChrome.hidden.bookmarkbar_label", true);
// user_pref("userChrome.hidden.disabled_menu", true);

// user_pref("userChrome.centered.tab", true);
// user_pref("userChrome.centered.tab.label", true);
// user_pref("userChrome.centered.urlbar", true);
// user_pref("userChrome.centered.bookmarkbar", true);

// user_pref("userChrome.counter.tab", true);
// user_pref("userChrome.counter.bookmark_menu", true);

// user_pref("userChrome.combined.nav_button", true);
// user_pref("userChrome.combined.nav_button.home_button", true);
// user_pref("userChrome.combined.urlbar.nav_button", true);
// user_pref("userChrome.combined.urlbar.home_button", true);
// user_pref("userChrome.combined.urlbar.reload_button", true);
// user_pref("userChrome.combined.sub_button.none_background", true);
// user_pref("userChrome.combined.sub_button.as_normal", true);

// user_pref("userChrome.rounding.square_button", true);
// user_pref("userChrome.rounding.square_dialog", true);
// user_pref("userChrome.rounding.square_panel", true);
// user_pref("userChrome.rounding.square_panelitem", true);
// user_pref("userChrome.rounding.square_menupopup", true);
// user_pref("userChrome.rounding.square_menuitem", true);
// user_pref("userChrome.rounding.square_infobox", true);
// user_pref("userChrome.rounding.square_toolbar", true);
// user_pref("userChrome.rounding.square_field", true);
// user_pref("userChrome.rounding.square_urlView_item", true);
// user_pref("userChrome.rounding.square_checklabel", true);

// user_pref("userChrome.padding.first_tab", true);
// user_pref("userChrome.padding.first_tab.always", true);
// user_pref("userChrome.padding.drag_space", true);
// user_pref("userChrome.padding.drag_space.maximized", true);

// user_pref("userChrome.padding.toolbar_button.compact", true);
// user_pref("userChrome.padding.menu_compact", true);
// user_pref("userChrome.padding.bookmark_menu.compact", true);
// user_pref("userChrome.padding.urlView_expanding", true);
// user_pref("userChrome.padding.urlView_result", true);
// user_pref("userChrome.padding.panel_header", true);

// user_pref("userChrome.urlbar.iconbox_with_separator", true);

// user_pref("userChrome.urlView.as_commandbar", true);
// user_pref("userChrome.urlView.full_width_padding", true);
// user_pref("userChrome.urlView.always_show_page_actions", true);
// user_pref("userChrome.urlView.move_icon_to_left", true);
// user_pref("userChrome.urlView.go_button_when_typing", true);
// user_pref("userChrome.urlView.focus_item_border", true);

// user_pref("userChrome.tabbar.as_titlebar", true);
// user_pref("userChrome.tabbar.fill_width", true);
// user_pref("userChrome.tabbar.multi_row", true);
// user_pref("userChrome.tabbar.unscroll", true);
// user_pref("userChrome.tabbar.on_bottom", true);
// user_pref("userChrome.tabbar.on_bottom.above_bookmark", true); // Need on_bottom
// user_pref("userChrome.tabbar.on_bottom.menubar_on_top", true); // Need on_bottom
// user_pref("userChrome.tabbar.on_bottom.hidden_single_tab", true); // Need on_bottom
// user_pref("userChrome.tabbar.one_liner", true);
// user_pref("userChrome.tabbar.one_liner.combine_navbar", true); // Need one_liner
// user_pref("userChrome.tabbar.one_liner.tabbar_first", true); // Need one_liner
// user_pref("userChrome.tabbar.one_liner.responsive", true); // Need one_liner

// user_pref("userChrome.tab.bottom_rounded_corner.all", true);
// user_pref("userChrome.tab.bottom_rounded_corner.australis", true);
// user_pref("userChrome.tab.bottom_rounded_corner.edge", true);
// user_pref("userChrome.tab.bottom_rounded_corner.chrome", true);
// user_pref("userChrome.tab.bottom_rounded_corner.chrome_legacy", true);
// user_pref("userChrome.tab.bottom_rounded_corner.wave", true);
// user_pref("userChrome.tab.always_show_tab_icon", true);
// user_pref("userChrome.tab.close_button_at_pinned", true);
// user_pref("userChrome.tab.close_button_at_pinned.always", true);
// user_pref("userChrome.tab.close_button_at_pinned.background", true);
// user_pref("userChrome.tab.close_button_at_hover.always", true); // Need close_button_at_hover
// user_pref("userChrome.tab.close_button_at_hover.with_selected", true); // Need close_button_at_hover
// user_pref("userChrome.tab.sound_show_label", true); // Need remove sound_hide_label
// user_pref("userChrome.tab.container.on_top", true);
// user_pref("userChrome.tab.container.always_long", true);
// user_pref("userChrome.tab.sound_with_favicons.on_center", true);
// user_pref("userChrome.tab.selected_bold", true);

// user_pref("userChrome.navbar.as_sidebar", true);

// user_pref("userChrome.bookmarkbar.multi_row", true);

// user_pref("userChrome.findbar.floating_on_top", true);

// user_pref("userChrome.panel.remove_strip", true);
// user_pref("userChrome.panel.full_width_separator", true);
// user_pref("userChrome.panel.full_width_padding", true);

// user_pref("userChrome.sidebar.overlap", true);

// user_pref("userChrome.icon.disabled", true);
// user_pref("userChrome.icon.account_image_to_right", true);
// user_pref("userChrome.icon.account_label_to_right", true);
// user_pref("userChrome.icon.menu.full", true);
// user_pref("userChrome.icon.global_menu.mac", true);

// -- User Content -------------------------------------------------------------
// user_pref("userContent.player.ui.twoline", true);

// user_pref("userContent.newTab.hidden_logo", true);
// user_pref("userContent.newTab.background_image", true); // Need wallpaper image to `userContent.css`. :root { --uc-newTab-wallpaper: url("../icons/background_image.png"); }

// user_pref("userContent.page.proton_color.dark_blue_accent", true);
// user_pref("userContent.page.proton_color.system_accent", true);
// user_pref("userContent.page.dark_mode.pdf", true);
// user_pref("userContent.page.monospace", true);

// == Theme Default Settings ===================================================
// -- User Chrome --------------------------------------------------------------
user_pref("userChrome.compatibility.theme", true);
user_pref("userChrome.compatibility.os", true);

user_pref("userChrome.theme.built_in_contrast", true);
user_pref("userChrome.theme.system_default", true);
user_pref("userChrome.theme.proton_color", true);
user_pref("userChrome.theme.proton_chrome", true); // Need proton_color
user_pref("userChrome.theme.fully_color", true); // Need proton_color
user_pref("userChrome.theme.fully_dark", true); // Need proton_color

user_pref("userChrome.decoration.cursor", true);
user_pref("userChrome.decoration.field_border", true);
user_pref("userChrome.decoration.download_panel", true);
user_pref("userChrome.decoration.animate", true);

user_pref("userChrome.padding.tabbar_width", true);
user_pref("userChrome.padding.tabbar_height", true);
user_pref("userChrome.padding.toolbar_button", true);
user_pref("userChrome.padding.navbar_width", true);
user_pref("userChrome.padding.urlbar", true);
user_pref("userChrome.padding.bookmarkbar", true);
user_pref("userChrome.padding.infobar", true);
user_pref("userChrome.padding.menu", true);
user_pref("userChrome.padding.bookmark_menu", true);
user_pref("userChrome.padding.global_menubar", true);
user_pref("userChrome.padding.panel", true);
user_pref("userChrome.padding.popup_panel", true);

user_pref("userChrome.tab.multi_selected", true);
user_pref("userChrome.tab.unloaded", true);
user_pref("userChrome.tab.letters_cleary", true);
user_pref("userChrome.tab.close_button_at_hover", true);
user_pref("userChrome.tab.sound_hide_label", true);
user_pref("userChrome.tab.sound_with_favicons", true);
user_pref("userChrome.tab.pip", true);
user_pref("userChrome.tab.container", true);
user_pref("userChrome.tab.crashed", true);

user_pref("userChrome.fullscreen.overlap", true);
user_pref("userChrome.fullscreen.show_bookmarkbar", true);

user_pref("userChrome.icon.library", true);
user_pref("userChrome.icon.panel", true);
user_pref("userChrome.icon.menu", true);
user_pref("userChrome.icon.context_menu", true);
user_pref("userChrome.icon.global_menu", true);
user_pref("userChrome.icon.global_menubar", true);
user_pref("userChrome.icon.1-25px_stroke", true);

// -- User Content -------------------------------------------------------------
user_pref("userContent.player.ui", true);
user_pref("userContent.player.icon", true);
user_pref("userContent.player.noaudio", true);
user_pref("userContent.player.size", true);
user_pref("userContent.player.click_to_play", true);
user_pref("userContent.player.animate", true);

user_pref("userContent.newTab.full_icon", true);
user_pref("userContent.newTab.animate", true);
user_pref("userContent.newTab.pocket_to_last", true);
user_pref("userContent.newTab.searchbar", true);

user_pref("userContent.page.field_border", true);
user_pref("userContent.page.illustration", true);
user_pref("userContent.page.proton_color", true);
user_pref("userContent.page.dark_mode", true); // Need proton_color
user_pref("userContent.page.proton", true); // Need proton_color

// ** Useful Options ***********************************************************
// Tab preview
// https://blog.nightly.mozilla.org/2024/02/06/a-preview-of-tab-previews-these-weeks-in-firefox-issue-153/
user_pref("browser.tabs.cardPreview.enabled", true);

// Paste suggestion at urlbar
// https://blog.nightly.mozilla.org/2023/12/04/url-gonna-want-to-check-this-out-these-weeks-in-firefox-issue-150/
user_pref("browser.urlbar.clipboard.featureGate", true);

// Integrated calculator at urlbar
user_pref("browser.urlbar.suggest.calculator", true);

// Integrated unit convertor at urlbar
// user_pref("browser.urlbar.unitConversion.enabled", true);

// Draw in Titlebar
// user_pref("browser.tabs.drawInTitlebar", true);
// user_pref("browser.tabs.inTitlebar", 1); // Nightly, 96 Above

// Searchbar, Removed from settings starting with FF v122
// user_pref("browser.search.widget.inNavBar", true);

// Firefox view search
// https://blog.nightly.mozilla.org/2023/12/14/better-searching-in-firefox-to-close-out-2023-these-weeks-in-firefox-issue-151/
// user_pref("browser.firefox-view.search.enabled", true);
// user_pref("browser.firefox-view.virtual-list.enabled", true);

// Firefox screenshot
// https://blog.nightly.mozilla.org/2024/01/22/happy-new-year-these-weeks-in-firefox-issue-152/
// user_pref("screenshots.browser.component.enabled", true);

// ** Scrolling Settings *******************************************************
// == Only Sharpen Scrolling ===================================================
// Pref Value Original
/*
user_pref("mousewheel.min_line_scroll_amount", 10); // 5
user_pref("general.smoothScroll.mouseWheel.durationMinMS", 80); // 50
user_pref("general.smoothScroll.currentVelocityWeighting", "0.15"); // "0.25"
user_pref("general.smoothScroll.stopDecelerationWeighting", "0.6"); // "0.4"
*/

// == Smooth Scrolling ==========================================================
// ** Scrolling Options ********************************************************
// based on natural smooth scrolling v2 by aveyo
// this preset will reset couple extra variables for consistency
// Pref Value Original
/*
user_pref("apz.allow_zooming", true); /// true
user_pref("apz.force_disable_desktop_zooming_scrollbars", false); /// false
user_pref("apz.paint_skipping.enabled", true); /// true
user_pref("apz.windows.use_direct_manipulation", true); /// true
user_pref("dom.event.wheel-deltaMode-lines.always-disabled", true); /// false
user_pref("general.smoothScroll.currentVelocityWeighting", "0.12"); /// "0.25" <- 1. If scroll too slow, set to "0.15"
user_pref("general.smoothScroll.durationToIntervalRatio", 1000); /// 200
user_pref("general.smoothScroll.lines.durationMaxMS", 100); /// 150
user_pref("general.smoothScroll.lines.durationMinMS", 0); /// 150
user_pref("general.smoothScroll.mouseWheel.durationMaxMS", 100); /// 200
user_pref("general.smoothScroll.mouseWheel.durationMinMS", 0); /// 50
user_pref("general.smoothScroll.mouseWheel.migrationPercent", 100); /// 100
user_pref("general.smoothScroll.msdPhysics.continuousMotionMaxDeltaMS", 12); /// 120
user_pref("general.smoothScroll.msdPhysics.enabled", true); /// false
user_pref("general.smoothScroll.msdPhysics.motionBeginSpringConstant", 200); /// 1250
user_pref("general.smoothScroll.msdPhysics.regularSpringConstant", 200); /// 1000
user_pref("general.smoothScroll.msdPhysics.slowdownMinDeltaMS", 10); /// 12
user_pref("general.smoothScroll.msdPhysics.slowdownMinDeltaRatio", "1.20"); /// "1.3"
user_pref("general.smoothScroll.msdPhysics.slowdownSpringConstant", 1000); /// 2000
user_pref("general.smoothScroll.other.durationMaxMS", 100); /// 150
user_pref("general.smoothScroll.other.durationMinMS", 0); /// 150
user_pref("general.smoothScroll.pages.durationMaxMS", 100); /// 150
user_pref("general.smoothScroll.pages.durationMinMS", 0); /// 150
user_pref("general.smoothScroll.pixels.durationMaxMS", 100); /// 150
user_pref("general.smoothScroll.pixels.durationMinMS", 0); /// 150
user_pref("general.smoothScroll.scrollbars.durationMaxMS", 100); /// 150
user_pref("general.smoothScroll.scrollbars.durationMinMS", 0); /// 150
user_pref("general.smoothScroll.stopDecelerationWeighting", "0.6"); /// "0.4"
user_pref("layers.async-pan-zoom.enabled", true); /// true
user_pref("layout.css.scroll-behavior.spring-constant", "250.0"); /// "250.0"
user_pref("mousewheel.acceleration.factor", 3); /// 10
user_pref("mousewheel.acceleration.start", -1); /// -1
user_pref("mousewheel.default.delta_multiplier_x", 100); /// 100
user_pref("mousewheel.default.delta_multiplier_y", 100); /// 100
user_pref("mousewheel.default.delta_multiplier_z", 100); /// 100
user_pref("mousewheel.min_line_scroll_amount", 0); /// 5
user_pref("mousewheel.system_scroll_override.enabled", true); /// true <- 2. If scroll too fast, set to false
user_pref("mousewheel.system_scroll_override_on_root_content.enabled", false); /// true
user_pref("mousewheel.transaction.timeout", 1500); /// 1500
user_pref("toolkit.scrollbox.horizontalScrollDistance", 4); /// 5
user_pref("toolkit.scrollbox.verticalScrollDistance", 3); /// 3
*/
```

### Additional context

_No response_

Reproduce the rounded checkbox issue in the download prompt and page info window using Firefox 127 on Windows 10, in both light and dark themes. Compare the rendered controls with the expected appearance shown in the issue and identify the relevant userChrome styling; done means both locations display the intended rounded checkboxes without breaking square checkbox behavior.

Written by the indexing model from the issue text.