Firefox Support Forum

Dark Mode used to work beautifully in Firefox. Today it stopped working. I can choose Dark Mode in the settings page, and the settings page itself then uses Dark Mode. But Dark Mode does not work in any of the other pages, only the settings page. I think it must be a flaw in an update that was installed automatically today. (September 7, 2021)

Is there a way to uninstall this update and go back to the previous version. Dark Mode used to work beautifully and Firefox was my favorite browser. Can someone help? Thanks.

Why can a stupid failing script on a web-page, or even intentionally so programmed script disable the copy (and sometimes paste) functionality?

How can this be disabled/fixed?

One highlights a text (any text) on some web sites, Edit menu allows Copy, context menu allows Copy, one hits Copy, nothing happens. It's not even a page where someone wanted to "copy protect" some information.

Copy and Paste should work just as advertised since those were invented, how hard can it be to get that right? Even stupid Notepad never fails at it. And no, I don't care what the idiot who programmed a page though would be/should be best for me, I want Copy to be copy, Paste to be paste. This used to work in "original" Firefoxes even when page developers wanted to make it not work.

And yes, while on a given page Copy fails miserably, at the same time in other pages it works.

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An error occurred during a connection to www.myutiitsl.com. 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.

How can I permanently force firefox's automatic updates to be turned off? Which guy modified the original design for the new version of Firefox bookmarks? Is there something wrong with that man's brain? Is the spacing of the new bookmark item too large to read? It's very uncomfortable.

Chrome has a really fantastic feature called "Tab Groups" - it's pretty self explanatory but it basically allows you to quickly group related sets of tabs.

This is an incredibly useful feature but it seems Firefox hasn't got anything like it.

I've tried a few of the third party add-ons such as Tree-Style-Tabs but they're all over-complicated, take up too much screen real estate or change the way tabs operate.

Is adding simple Tab Grouping functionality on the Firefox roadmap?

If not - has anyone found any good add-ons to replicate the Chrome functionality?

FFox 92 update today. Menu spacing went to double. No shock there. Found the CSS code below for UserChrome.css and set it up.

EX.

menupopup > menuitem, menupopup > menu {
  padding-block: 4px !important;
}
:root {
  --arrowpanel-menuitem-padding: 4px 8px !important;
}

EX:

menupopup > menuitem, menupopup > menu {
  padding-block: 0px !important;
}
:root {
  --arrowpanel-menuitem-padding: 0px 0px !important;
}

But, it doesn't get any smaller than the above 4/8px set up. Bug? Perhaps there's another CSS setting to be tweaked for V 92? I do not have any other CSS for these items elsewhere in my UserChrome file.

I can't open or create facebook accounts with any browser. Why? Even as soon as creating a new facebook account and nothing is posted, I am not obey their community rules. I do nothing strange and peculiar things. For example, First Name: Myo Last Name:Tun DOB:28/12/1978

Nothing is out of facebook community standard. But I can't use facebook with any browser. Why?

With respect, Myo Min Tun, Myanmar.

Hi, I've been having issues with Firefox for some time now. Every page I got to throws a NS_ERROR_NET_INADEQUATE_SECURITY error. I cannot fix it by setting network.http.spdy.enabled.http2 to false is because Firefox then starts crashing. In the past I've gone around the error by turning http2 off, but recently, first the developer edition, then after today's update to 91.0-0.1 of stable version Firefox crashes if I turn the feature off.

The developer Edition started throwing NS_ERROR_NET_INADEQUATE_SECURITY sometime in spring, then started crashing in June I think. The stable version followed soon as described above.

I am submitting this ticket from a beta version, which for some reason does not have this issue.

I thought it may be the Linux version of Eset, but removing it did not help. I cannot think of any other reason why am I getting those errors, but it seems I am alone because my colleagues don't seem to have this issue neither on macOS, nor Windows.

I just installed the latest Version of Firefox 101.0 for Windows 10. Then when I tried to download a pdf file from my yahoo mail I received the following message: "Problem loading page" Firefox Can’t Open This Page To protect your security, dl-mail.ymail.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window. Learn more… Open Site in New Window Report errors like this to help Mozilla identify and block malicious sites

So, in order to open the page I have to press "Open Site in New Window"

Please advice why happened this issue and how can be fixed.

Just updated to V89. What I don't like is the font size in the tool bar. I used the zoom control but that doesn't change the font size in the tool bar. Any suggestions as to how to change the tool bar size and/or the font size? Thanks

With Firefox 91, I can no longer disable the hideous Proton changes to tabs. Separating tabs from their content is a really poor user interface decision. It makes it harder to tell which tab is the current tab. With Proton, the active tab is slightly brighter than the inactive tabs. For older folks and color blind folks, this makes it all but impossible to to tell which tab is active.

If you won't come to your senses and revert this bad user interface decision, then at least add an official option to disable it and go back to the old tab style that other browsers use. If you won't do that, then I will just have to use a different browser. Which makes me very sad, because aside from your bad sense in user interface design, I loved Firefox.

Why am I now having Bing show up as my default search engine when opening Firefox? I don't want Bing but can't find any way to remove it. My settings are such that Yahoo should show upon opening the browser and Google is set as my default search engine. I've uninstalled, reinstalled, check settings, etc. but I still get the damn Bing showing up as my home page and search engine. Any help would be appreciated.

Every day I get a Firefox popup that says, "Firefox cannot download the latest version. Download the latest version and we will help you install it". Sometimes the popup appears immediately after I open my browesr, and sometimes it appears after I've been using the browser for several hours.

I've been doing the daily download and install, but I want to know what's causing this. I'm using a Late 2015 21.5" iMac running macOS Catalina Version 10.15.7. Firefox is Version 82.0b4, set as default browser with automatic updates turned on. I've been running Beta versions of Firefox for >2 years and have not had problems with updates before this. Thanks for any suggestions and solutions!

Win10 with what was Firefox 89. I had already disabled the Proton UI on this installation, because it is horrible. Today Firefox decided to update to version 91. All of the Proton UI junk is back. I tried disabling it again, but nothing worked. Doing a web search, it appears that Mozilla has disabled the ability to turn off Proton.

I then set about to rollback the installation back to version 89. I found a Mozilla link on this, went to their ftp server and downloaded the installation files for the last version of 89. The installation went normally, but when I opened Firefox afterwards, a little box popped up saying something to the effect of "To keep your History and Bookmarks from possibly being corrupted, Firefox must create new user profile." I exited out of this and Firefox didn't start. I attempted to restart Firefox again and the same box popped up again. The only way to get past it was to click the accept button.

I did so and Firefox started. This was clearly not version 89. As the UI is junk, it took several minutes to find out that this was now the latest version of 92!!!! I'm absolutely positive that I downloaded the correct file. When I look through the update history, it doesn't even show todays version 89 installation as happening. What a piece of junk.

I then spent 20 minutes figuring out how to revert back to my user profile, not the new one that it had created for me. I then did some research on what had happened. Well it turns out that you can't actually rollback Firefox, despite what Mozilla says. For a while they have added "downgrade protection" which automatically creates the new user profile and stops your old profile from being accessed by it. So unless you want to figure out how to spend a hundred hours reconstructing bookmarks, passwords, settings, etc. it actually isn't possible to rollback Firefox. Doesn't this violate some Microsoft rules about being able to uninstall versions of software from within Windows? If you try to do this with Firefox and go back to a previous version it blows everything up.

Does anyone know how to actually rollback Firefox to a previous version, so that Proton can be disabled?