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Hello ! I'm confronted to a very weird behavior of Firefox, on Ubuntu 24.04.

When I'm clicking on a link in a mail of pdf document, the page opens in Firefox, I can navigate and click in it but when I try to type something (for instance to enter my id to connect), the keyboard does not consider I'm in Firefox but still in the previous application (Thunderbird etc). To be able to type something in Firefox, I need to go back to another window (alt tab) then go back to Firefox manually...

This also occurs if Firefox hides the other application on the screen. Note that from the colors of the windows (the tone of grey), I looks like that Firefox is the active window and no longer Thunderbird.

I tried to summary this in the following image.

My browser is using 2,3 Gb of extra ram it goes away by restarting but comes back in 5-10 min. It occurs wathing twich, i have tried disabling extentsions but it doesn't work. in about:memory the readout is as thoug it is keaping an extra copy of open browser files in ram.

2,511.83 MB (100.0%) -- heap ├──2,301.00 MB (91.61%) -- committed │ ├──2,016.65 MB (80.29%) ── unused-pages/dirty │ ├────230.75 MB (09.19%) ── allocated │ ├─────32.96 MB (01.31%) ++ bin-unused │ └─────20.65 MB (00.82%) ++ (2 tiny) └────210.82 MB (08.39%) -- decommitted

    ├──210.21 MB (08.37%) ── unmapped
    └────0.61 MB (00.02%) ++ unused-pages

windows 11 Firefox . Unable to close tabs on X button when multiple tabs are open. Occurs after sleep state. Solution is right click and then close each tab or close application.

159.0 (aarch64) still has many issues across sites.

I have cleared the cache on these sites. I have removed cookies. Restarted the browser. Restarted the computer.

On Instagram and YouTube especially, when you click their tab, many times the page is now blank, you canot reload it, it just dissappears. If ti is there, clicking around is extremely slow if not unresponsive.

It is a tad better in the latest update, a small tad, but still very much broken from previous release.

I have a screen recording

안녕하세요

파이어 폭스를 애용하고 있는 한국인입니다

저는 최근 (약 2026년 10월 동안) 파이어 폭스를 사용할때 컴퓨터 팬 돌아가는 소리가 계속 들린다는 사실을 꺠달았습니다

작업관리자를 통해 확인해봤는데 제 컴퓨터에 설치된 램 64GB 중 34GB를 파이어 폭스가 사용하고 있다는 사실을 알게 되었습니다

확실하게 버그 같아 보이고 그 정도의 용량이 파이어 폭스에 필요한지 모르겠으나 만약 의도한 설정이 아니라면 꼭 고쳐주세요

사진을 첨부합니다 이 사진이 찍을 당시 파이어 폭스로 켜져있는것은 유튜브 창 두개 커뮤니티 창 하나 였습니다

감사합니다

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