🐞Issues with resizing when comments is in sidebar

Concise Description

Sides of video may be cut off when comments section is set to sidebar and browser window is smaller than can accommodate player size.
Can be caused by snapping browser window to full-screen then half-screen.
Can be fixed by enabling theatre mode before making browser window smaller, then disabling theatre mode.
Is not fixed by changing browser zoom.
Can be fixed by disabling and re-enabling sidebar comments.
Is not consistent.

Browser/s

Firefox

Other Browser:

No response

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

Enable sidebar comments. Resize browser window to be smaller than can accommodate player's current size. Bug can occur whether sidebar is set to left or right sides.

Since when?

At least 14/6/26

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

None

..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)

No response

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

None

Expected preferred behavior:

No response

ImprovedTube Version

No response

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

No response

Your YouTube-Document

No response

OS / Device:

No response

Start by reproducing the issue with sidebar comments enabled in Firefox, then resize or snap the browser below the player's current size with the sidebar on either side. Trace the sidebar and player resizing behavior; done means the full video remains visible and the layout recovers consistently without toggling theatre mode or the sidebar.