Firefox supportforum

Is there a quick short cut key stroke to turn ON/Off the Firefox browser screen Dark Theme? If the Windows 10 professional 64 Bit screen settings are set for Dark theme in Hi Contrast settings, for the visually impaired, The Firefox browser displays in bright white screen.

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.

The problem comes from the antivirus software this checks HTTPS connections and certificates, many think it would be a virus as in the support cases, but this can be set in the antivirus software.

https://support.mozilla.org/de/questions/1024043#question-reply

I've been not able to access any website 'cause of this PR_END_OF_FILE_ERROR I clearly checked it and connected all the networks but it's not accessing any website, i need help ASAP

Help! Firefox is blocking my access to Walgreens Weekly Ads context due to private browsing but not using and/or tracker or ad blockers but turned off for this site

After the last update, I get the "PR end of file" error on several of my trusted web sites, like my bank. I like FF and have used it for years, but keep getting frustrated with things like this. Its equally frustrating to have to wade thru the "fixes". I shouldnt have to do this. Brave is looking better and better

Is there a reason no one has developed a simple Restart browser button, that will open the browser in the same, last session?

I know you can do it from "About:Profiles", but it would be convenient to have it on the toolbar. I'm sure a lot of people would appreciate it.

I can't open aol email attachments. I have cleared the cache, reset firefox, checked my firewall, and opened my email in another broweser - which allowed me to download the attachments. What have I missed?

I was quite unhappy with the new Firefox Proton design, so I made a CSS file and copied the following code from a website. However, I don't know what to do to (1) slightly reduce the tab height, (2) get back tab borders for inactive tabs and (3) remove the small gaps between tabs. How exactly do I have to change the following code to do so (ideally, for convenience, please just complete the code accordingly)? Thanks in advance for any support!

/*** Tighten up drop-down/context/popup menu spacing (8 Sep 2021) ***/

menupopup:not(.in-menulist) > menuitem, 
menupopup:not(.in-menulist) > menu {
  padding-block: 2px !important; /* reduce to 3px, 2px, 1px or 0px as needed */ 
  min-height: unset !important; /* v92.0 - for padding below 4px */
}
:root {
  --arrowpanel-menuitem-padding: 4px 8px !important;
}

/*** Proton Tabs Tweaks ***/

/* Adjust tab corner shape, optionally remove space below tabs */

#tabbrowser-tabs {
    --user-tab-rounding: 6px;
}

.tab-background {
    border-radius: var(--user-tab-rounding) var(--user-tab-rounding) 0px 0px !important;
    margin-block: 1px 0 !important;
}
#scrollbutton-up, #scrollbutton-down { /* 6/10/2021 */
    border-top-width: 1px !important;
    border-bottom-width: 0 !important;
}
/* Container color bar visibility */
.tabbrowser-tab[usercontextid] > .tab-stack > .tab-background > .tab-context-line {
    margin: 0px max(calc(var(--user-tab-rounding) - 3px), 0px) !important;
}

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.

When i look at a map embedded in website the cursor disappears and only shows up randomnly or when you stop moving the mouse. This makes using maps in Firefox impossible. Must be related to Firefox - works in Google Chrome Please fix or advise or I have to change webbrowser

I've been unable to open Google Maps for the last couple of months, or so. It doesn't matter whether I try directly through a Google search, or from within another website.

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.

Suddenly my mouse cursor is erratic when I am using Google Maps through Firefox. The cursor is invisible and shows up erratically on the screen. Very hard to select anything on a map. This problem seems to have started out of the blue yesterday (September 10, 2021). I made no changes to anything that I am aware of. This problem does not happen on any other browser page, or any other application on my PC. Just Google maps through Firefox. I tried Google Chrome and the cursor worked fine.