Firefox Community Forum

In Firefox, I have several windows open, each with many tabs. (And BTW, I love the Firefox tab-organization feature.) I would like to empty the cache and delete all cookies. Will that close the open tabs? Is there a way to delete the cookies, empty the cache and preserve all windows & tabs?

      Thank you!

I cannot get into my online accounts, as I have always done for years. After I select the site, the screen looks like it is working, but then a new empty window pops up: the tab says "citi 400 Bad Request" At the top of the empty screen it says: Bad Request. Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit.

I am using Firefox (156.01) on a MacBook Pro (2023, M2 Mac Pro, Tahoe 26.7).

In Privacy and Security settings, I have checked the box to clear history and site data on closing. History is clearing, but site data is not. I can manually clear history and site data by going to the settings when I reopen it.

I noticed this issue about two weeks ago (not sure when it started). I have closed Firefox multiple times, restarted my computer multiple times, even updated my OS during this time, but the problem is consistent.

If I go to Clear Data for Specific Sites, I am also noticing that cache size is considerably higher than the sites listed (e.g., it might list 4 sites with a total of like 2MB but the cache size might be 30MB).

Do you have any suggestions for what might be happening and what fixes I might try?