Diễn đàn hỗ trợ Firefox

7/7/2026 Last night Firefox on my laptop performed an automatic update to the latest Firefox version. The new Firefox has a very bad setting in about;config .. this new Firefox can only show 1 tab ... it is opening up a new tab on top of the first tab, making it impossible to have more than 1 tab ..

This is going cause problems for thousands of Firefox users .. . how I fix this problem ... I tried setting the add tab settings into about;config to add a new tab to the right of the current tab, but my change made no difference ... how can I fix this problem ... does Firefox have a plan on how to fix for this problem for thousands of Firefox users.. this problem will impact thousands of Firefox users..

I'd like to start adding my customized settings to a user.js file. How can I figure out what the correct code is for each option under Tools|Settings in FF 140.12 ESR

I have my ... what do you call it? ... GTK? set up to widen the scroll bar when I hover over it. Problem is that it widens *before* the mouse cursor has moved onto the narrow bar -- it widens as soon as the cursor moves onto the territory that *will be* on the wider bar and thus, if there's a click button at the very edge of the page, it gets hidden by the expanded bar. Would it not make more sense to only expand the bar if the cursor actually moves onto it?

Hey all,

at shell:startup on windows i will open firefox two times (first for multimedia like tv-stream and maston, second for "working activities" like webmail, office online).

How can i open by file explorer link (like in shell:startup) a new tab (newspaper) everytime in instance "first" even if i was using second at last?

Dear reader,

I wanted to completely removed Firefox because i had some issues. Instead om removing I probably refreshed FF.

Can somebody help with?

1. How to remove old FF data which is placed on my desktop and blocked for removal by admin rights. 2. How to completely remove FF without leaving any data (profiles, extensions)

I have tried to find this answers in the help sections but I was not able to find the solution for my situation.

Thanks in advance. With kind regards,

Ilco

Enhanced Tracking Protection is stopping me from accessing many websites which, on other browsers including Firefox for Android, have nothing wrong with them - UK Met Office, forums, webcomics, Patreon... In many places, it's stopping me from connecting to the website altogether, or even logging into desktop app services when I have to use a browser link to log in; the login process simply doesn't resolve. I've tried disabling and removing extensions, changing settings, refreshing the browser and clearing the startup cache, but nothing seems to help. I cannot work out what's wrong, and I cannot disable Enhanced Tracking Protection. I'm having to send this message via TOR browser, because on Firefox, the Mozilla Support site is reduced to just text and links, with no frames or images, and barely navigable. This also means I can't pull Troubleshooting data direct from my Firefox browser for this form, because the form page's display is also broken on Firefox; I may be able to provide troubleshooting data on request, but I will require step-by-step guidance.

I don't know what to do, and I need help.

Greetings,

I'm using & viewing the most updated Firefox browser on a Windows 10 Pro (64 bit), desktop, 24" monitor screen.

With the current updates, the list of bookmarks in my Bookmarks Bar has become very small, skinny & overly spaced, hampering readability.

Though I have learned how to enlarge the bookmarks font size, using the "about:config" & updating the 'layout.css.devPixelsPerPx' attribute, the font still remains very skinny & overly spaced.

Is there an attribute that I can change to alter the Font Style (for example to "Semi-bold") & Spacing of the bookmarks list? If so, please be kind enough to describe the process & I'll give it a go.

If a Firefox Development Team member happens to be reading this post, I'd like to put in a request to add some Bookmarks Bar "FONT EDITING" tools accessible via the browser SETTINGS dialogue, to accommodate readability on ALL the various OS & computer form factors that have proliferated these days.

Thank you, Bruce

Secure Connection Failed

An error occurred during a connection to feg.uh1.ac.ma. SSL received a record with an incorrect Message Authentication Code.

Error code: SSL_ERROR_BAD_MAC_READ

The entire browser was acting extremely slowly, on every website, every start up. It crashed constantly to the point it was unusuable, it was even affecting the performance of the rest of my pc so I reset it and everything I had on the browser disappeared. Bookmarks, passwords, etc. I've tried going through the profile support pages but only the profile made from the reset exists. I had years worth of important bookmarks and passwords that'd I'd like to be able to get back if that's at all possible. (I'll live without them, it'll just suck trying to remember them all again) PC is Acer Aspire 3 Spin 14, Windows 10

A while ago I made some changes in about:config and also in my ~/.config/gtk-3.0/gtk,css file so as to control my scrollbar and slider -- making them more visible:

/* Log out, and back in for these changed to take effect: */

scrollbar { background-color: #cccccc; } scrollbar slider { min-width: 20px; }

/* dark green: pointer is not in the active window */ scrollbar slider:backdrop { background-color: #00aa00; }

/* green: pointer is in the active window but not on a slider */ scrollbar slider { background-color: #00ff00; }

/* dark red: pointer is hovering over slider but mouse button not pressed */ scrollbar slider:hover { background-color: #aa0000; }

/* red: slider is active */ scrollbar slider:hover:active { background-color: #ff0000; }

/* No effect: */ /* scrollbar-color: blue white; */

... it works half the time. Some pages obey the above settings but other pages continued to show a scrollbar about a mm wide with the slider so faint as to barely be visible. So, in 'about:config' :

widget.non-native-theme.scrollbar.size.override 30

... at least made the narrow scrollbar a bit wider. But how to change it's color? Doing this in a file:

~/.mozilla/firefox/5dqk4533.default/chrome/userContent.css:

html,body{

   scrollbar-color: yellow blue !important;
  }
.... doesn't change anything.  Is there some complete guide to controlling the srollbars?  Nice if it could all be handled in one place of course.

OK so, I just updated Firefox to 115.34 Oesr (64-bit) on my Windows 7 Desktop. Before this update, it's been my practice to clear my cookies manually from unknown websites about 3 times a day, only keeping the "exception" cookies. But, since the update, there have been SOOO many cookies...something like 75 to 100 and EACH time I manually clear the cookies...even just minutes after I clear it and refresh the "Settings" page they appear again. And, the worst of it is that Google won't let me sign into Google websites like Play Store and Google.com search saying that "there has been unusual traffic..." and makes me solve capchas all day long. Other sites too say Unusual traffic like CVS and won't let me sign in either. And now, I'm not using a VPN.

I googled the matter and it was said to be was a known issue with the 115 update and the A.I. said to get rid of the ad blocker as a possible fix but, it didn't work. Have Firefox clear cache and cookies but that didn't work, changing "Tracking Protection" to "Standard". Nothing works. Is there an update fixing this issue? By the way, I have had Firefox set to clear cache and cookies upon closing. But the cookies pile up so quickly again. Thanks for your help

We thought this is simple. But it looks like we need to have words explained to us. Setting firefox to never remember history makes it produce some claims that it looks like it developers aren't really aware of the meaning of. Setting it to "Never remember history" makes it automatically check "Clear cookies and site data every time you close Firefox" and "Based on your history settings, Firefox deletes cookies and site data from your session when you close the browser.". After having done that firefox forces a restart. We use it a little bit and close it again. Then open it up and re-enable "Remember history". It will force another restart, and then suddenly remember all the things it was told not to remember. Like automatically relogging into google for you, opening tabs, and things like that.

So. Can someone explain to us the meaning of the words "forget", "never", "history", "clear", "cookies and site data", "every time", "close firefox", "deletes", "close the browser". We thought it couldn't be more obvious that what the user intends with these settings is for you to delete the user data. Like you claim you do. And then you wonder why people say firefox is bought and payed for by google. If anyone of you can find the time to take your tongues out of google long enough to define these words for us we would forever be thankful. Can please someone please teach us please english please?

Hi, I just upgraded from Windows 7 to Windows 10 home. One of the things that has changed is that my downloads don't stay. After closing Firefox the download is there but if you click on it it says "File missing or moved".

When on the home screen and with setting "3 rows" for shortcuts, the third row has two missing slots and I cannot add extra ones to fill in the gap. I don't want to make it "4 rows" as it will show an "add shortcuts" button which I feel is unnecessary if I plan to leave the 4th row empty. It is also happening on LibreWolf

i have a new website tvbmaloha.com called "aloha bumper stickers" , and the order page does not display on my desktop mac , but displays elsewhere fine . the page loads but it is consistently blank. godaddy has been unable to fix this , as the page loads fine on other devices. any help would be appreciated. thanks ! it displays with crome and safari fine.