🐞YouTube Preventing the Popup Player From Working

Concise Description

Hello, just wanted to submit a bug report with the Popup Player option of this extension.
This is my first time reporting so I hope I understand everything right.

Browser: Firefox 144.0.2 (64-bit) (up to date)

So I downloaded the "Improve YouTube!" extension today just for the popup player as my usual extension (YouTube Popout Player) isn't working. Turns out both popout players are currently not working for me.
I am using largely the default settings, I only disabled some extra buttons that I wasn't interested in and enabled the popup player.

Here is an image of the YouTube error:

Browser/s

Firefox

Other Browser:

No response

'Steps to reproduce' - Which of our features is required for the bug to happen?

1. Enable Popup Player in the settings. 2. Find a You Tube video, any video 3. Click "Popup" player button

Since when?

November 4th, may be older as I haven't needed to use a popup player for a while.

Does the bug still happen when you log out of YouTube?

Yes

..No? Then please paste your yt.config_.EXPERIMENT_FLAGS. Twice (With the error & Without)

No response

Are any errors or related log-messages shown in the Browser-Console? (F12)

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at data:text/plain;base64,Cg==. (Reason: CORS request not http).

Tested as the only active extension? (incognito mode or another browser users):

Yes

Expected preferred behavior:

Being able to play a video in the Popup player.

ImprovedTube Version

4.1350

Your Settings (From the Extension's ⋮-Hamburger menu > Settings > Backup & reset > Export settings)

improvedtube.json

'{"ambient_lighting":false,"below_player_keyscene":false,"below_player_loop":true,"below_player_pip":false,"below_player_screenshot":false,"forced_play_video_from_the_beginning":false,"lastDarkTheme":"dark","player_autoplay_disable":true,"player_crop_chapter_titles":false,"player_loudness_normalization":true,"player_popup_button":true,"player_quality":"highres","player_quality_without_focus":"highres","prevent_shorts_autoloop":true,"theme":"dark","up_next_autoplay":false}'

Your YouTube-Document

HTML Source.txt

OS / Device:

Windows 10 (up to date)

Start by reproducing the Popup Player steps in Firefox with the reported settings, then inspect the browser console for related errors. The issue is done when clicking the Popup player button opens a playable video window without the reported YouTube error.