Firefox zou niet automatisch moeten afsluiten, dit is mogelijk een probleem in uw besturingssysteem. In het Engelstalige forum vond ik een vraag die op deze lijkt: https://support.mozilla.org/en-US/questions/1400801

Firefox closes by itself after several hours, not at startup. I can start Firefox. Unknown why. Where can I find the option to disable or remove it? Also, it happens on another PC too. This happened after updating somewhere to version 100 and newer. They did not fix it.

Kijk ook eens naar dit artikel: https://support.mozilla.org/nl/kb/problemen-met-firefox-crashes-onverwacht-afsluiten, of in het Engels: https://support.mozilla.org/en-US/kb/troubleshoot-firefox-crashes-closing-or-quitting

Firefox keeps crashing. When it likes and many times. Sometimes the program can work for hours or days. Sometimes Firefox already crashes when I try to start it, starting takes longer times then before. Updating Firefox does nothing! Bugs are still there, they always return, fast or some time later. Same when using a new profile or private mode. Both who I don't like to use always to have a site working. Version 100 and up is worse of them all. And when running on Windows 10. Poor testing or not testing at all.

Unable to view YouTube videos anymore. I can see the picture, click on the play button and then no content message does appear. Worked before and happened after updating to version 132.0.1. Does not matter when I want to play a video on home screen / a video from the recommendations or a video from a subscribed channel. If a video start to play, it always the wrong one or stop near 1 minute.

Firefox does not finish loading sites, the dot keeps jumping. Tab has no title anymore. Site can be empty, mostly white or black. Have invalid or damaged content. Site takes longer time then I know to be loaded. Seeing error 500 - 502. One moment they work and another click, they don't work anymore. For example, the Nvidia store.

Have 30 or 80 Firefox running in list from Taskman. Last one seems always be crashed, have the "not responding" at right side.

When changing view between my opened windows, they can be empty, white or black. They can be nor longer responding anymore. Clicking on their windows or changing back can make them softer to see. A blue circle might appear. Windows can show a message that "program x" is not longer responding, give choices to wait or close it. Windows can show a message that "program x" must be closed, due it does something wrong. Windows can add "not responding" at right side from the "program x" in the list from Taskman.

Not longer possible or become difficult to run Thunderbird and Firefox at same time, one takes the other when crashing / make the other not longer responding anymore / I have more delays.

Not longer possible to get normal version of Thunderbird. Who also seems to crashing more, when it likes. Always seeing "need to compress" message while I'm doing with an e-mail message. Difficult to use a document from the e-mail. E-mail messages have now some garbage text at top, after the "to", "from", date and subject lines. Thunderbird doesn't let me copy pictures from earlier sent e-mail messages. Forwarding my e-mail message is changed too, why this longer way.