User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:126.96.36.199) Gecko/20080113 Firefox/188.8.131.52
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:184.108.40.206) Gecko/20080113 Firefox/220.127.116.11
Firefox slows down more and more over time. Eventually it takes 5 or 10 sec to register a mouse click. Finally I go to quit it, and then it takes hours as it cycles through every single window asking if I really want to close this one and that one.
Steps to Reproduce:
1. Open several windows.
2. Open several tabs in each window.
Irritating multiple confirm quit dialogs.
Maybe ask once if I really want to quit, then quit.
If you want to get really clever you could display in the quit window a tree of open windows and tabs.
with V3 I believe it now asks once
Now in v4 beta it doesn't ask at all
Considering this bug doesn't seem to affect the latest builds of Firefox(changeset: 62447:704dd93dad14) this bug should be marked "INVALID" or "FIXED".