Stipefoarum foar Firefox

why is this happening? successful load in chrome https://youtube.com/shorts/ICTGD5Q5ltc?feature=share

firefox failed to load https://youtube.com/shorts/nBokZxebJAk?feature=share

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Is there a simple method to turn off the annoying popup notifications about upgrading Firefox? I don't want to upgrade, FF seems to be working fine. Sometimes updates bring new problems.

I'm not a programmer, so I'm hoping there is a simple fix to stop update notices. I think it was a bad idea to have them appear in front of other websites. They often popup when I'm watching something on Netflix.

I've just discovered, that by typing text into urlbar and then clicking enter while holding SHIFT or ALT leads to a different behavior by opening tab in new window or new tab respectively.

But I have custom layout with caps+space acting as enter via xkb 8-level mapping, and that enter always opens new tabs. I suspect what is happening is that firefox thinks that I have alt down when the keyboard state is in third level. But I don't really use those modifiers so is it possible to just disable this behavior and open everything in same tab?