Firefox Community Forum

When I didn't know what I was doing, within Settings for Firefox desktop browser for Windows 10 where you can make associations for file types or applications, I began putting choices in that I felt made sense at the time. I don't think I've made the best choices and I would like to change that entire section with the heading Content Type to the defaults that would have appeared in the Action column. Is there a way I can return the defaults only for Content Type without resetting everything in the browser to the state it was first in before I began customizing some areas? Thanks.

Dear Team, I was asked to start an upload in Firefox. I tried that. I get the message 'Couldn't load XPCOM' What do I have to do to restart Firefox? It's urgently needed for account verification! Could this possibly be due to a lack of capacity? I currently have 371 MB of 111 KB available. I ask you to help me quickly - thank you very much.

Regards, Karin Gähler Phone +49 [phone number removed]

In paying my Illinois tax bills i tried to get a print out of my payment confirmation but the site said that this browser blocked my printing, as popups are blocked for their site from your browser

Again ONLY in FF harbor freight search function breaks when entering a search.

Yes, please don't give me the MS ctrl-alt-del type of response about cookies.... That was done many times before posting this. The website works fine in Brave. MS Edge well, let's not speak of it in public company shall we.

So, now what the heck is happening to FF???? I have contacted HF three times and they referred me to use other browsers other than FF. No, I DO NOT have multiple extensions nor themes. FF is bare bones but for uBlock. Hardware acceleration is off and MS Clear type is on. Anybody wanna fess up, who broke this????

Back around February (2025), the full screen mode by pressing F11 quit working. Clicking the diagonal two pointed arrow in the application menu didn't do it anymore either. Both actions only toggle the bookmark bar. I've tried reinstalling, and waiting for further updates. So far, still no luck. I've since moved on to using another browser, since I often want this feature. Does anyone have the same problem or know how to fix this?

I love having the ability to group some of my tabs but I'm wondering if it's possible to create "subgroups" of tabs inside of a "group". For instance, it would be very confusing & even chaotic to have one tab group named "Computers" that has tabs for sites where I buy computers/parts/software, sites where I go to for support for my hardware/software issues, & sites where where I can read reviews about the up & coming new hardware/software. However, the chaos would go away if I could have 3 tab subgroups (Shopping, Support, & News) UNDER a "top level" tab named "Computers".

From what I've been able to find on the Firefox website, this capability is not yet available but I'm wondering if it's something that's currently in development. If not, I would like to suggest that it be seriously considered. I realize that some people could take this kind of capability to the extreme, with hundreds of tabs organized using multiple "sub-tiers" & trying to develop something to support the extreme cases would be a nightmare. However, the ability to even two levels (groups & 1 level of subgroups) would be a HUGE improvement over the current situation.

When I go to taobao.com, the Chinese text on the product couldn't display normally. Some of the Chinese text are showing normally but some are not.

When I try to go to costco.ca I get a connectivity error saying site cannot redirect properly. This site works with IE or other browsers.

The page isn’t redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

   This problem can sometimes be caused by disabling or refusing to accept cookies.

‘New update for Firefox removed my bookmark menu from side bar. When I open FIrefox, my bookmarks are gone, but a one inch vertical, useless space appears. Please help.’ for ‘Firefox’

Today, I cannot even open the website!! This is what shows up:

"Secure Connection Failed An error occurred during a connection to mydorway.dor.sc.gov.

PR_CONNECT_RESET_ERROR Error code: PR_CONNECT_RESET_ERROR

The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

Learn more… "

I'm suddenly getting 30-50 popups a day from the above websites telling me that there are all sorts of trojans and viruses on my computer and telling me to "click here" to fix them. I WANT TO BLOCK THEM... as I'm quite sure they are scams. I just delete them, but they keep coming back How do I block them? Just got another one that says "Mozilla Firefox -- Trojan virus detected! Scan and delete with McAfee -- click here: via d14an00hubcc73a1lt40.quickupdevice.co.in". ...and I just got two more.

Please tell me how to stop this stuff. Thank you.