[bug] YouTube - Add Watch Later Button does not reckon containers in Firefox

[powerarmorpatch]

I have two YouTube accounts separated via containers in Firefox:

• Acc1 in No container environment (default)
• Acc2 in "Funstuff" container.

If I click the Watch Later Button in Acc2 "Funstuff" container, the video will be added to "Watch later" list for Acc1, i.e. for the account in default No container environment.
If I click the Watch Later Button in Acc1, the video will be added to "Watch later" list for Acc1 as expected.

Expected behavior: If I click the Watch Later Button in Acc2 "Funstuff" container, the video should be added to "Watch later" list for Acc2.

Script version 2.0.0, Firefox 119.0.1 on Ubuntu (Flatpak)