Diễn đàn hỗ trợ Firefox

My page throws errors in Firefox Nightly such as

Expected color but found ‘undefined’. Error in parsing value for ‘background-color’. Declaration dropped. preview.htm:1:1

and

Expected color but found ‘undefined’. Error in parsing value for ‘color’. Declaration dropped. preview.htm:1:1

The page references ten CSS files besides having dozens of its own CSS declarations. The issue is tha the reference provided to the error (:1:1) does not indicate where I can find the error. That is, I don't know which declaration is at fault. Is there some straighforward way to find the declaration in question?

How do I get rid of these constant firebox pop ups that block tabs that I have open. it is EXTREMELY affecting my ability to use my laptop. I WANT TO KNOW HOW STOP THIS BS

Today when I launched the browser, a sidebar appeared. No matter what I tried, I can't remove it, it really gets in the way, I searched for information all over the Internet, but I still couldn't find any information. How can I remove the sidebar?

I recently got norice that Firefox needed updating so I clicked on ok. When it got done updating, Firefox opened with my tabs but the tab spacing was gone as as well as there was no color in the Title bar and menu area, which was normally light blue to match Windows 10 22H2 backbrond I have. I looked at enabling the legacy support in about:config but it was already enabled. I use a Chrome UserChrome.css file that allows the tabs to have just a bit of space between them and rounded edges. I have vision issues and this made it so I could see open tabs and distinguish them.

This is the userChrome.css file I used: .titlebar-color{ color: AccentColorText !important; background-color: AccentColor; }

.tab-background{ border-radius: 8px 5px !important; margin-bottom: 2px !important; margin-top: 1px !important; } /* NEWTAB button */

1. new-tab-button,
2. tabs-newtab-button {

fill: red !important;
background-color: rgba(255,255,255,.7) !important;

}

/* NEWTAB button - hover */

1. new-tab-button:hover,
2. tabs-newtab-button:hover {

 fill: white !important;
 background-color: rgba(255,0,0,.7) !important;

} .tabbrowser-tab:not([selected=true]):not([multiselected=true]) .tab-background{ background-color: color-mix(in srgb, currentColor 25%, transparent); } menupopup > menu, menupopup > menuitem{ padding-block: 2px !important; min-height: 0px !important; }

root{

--arrowpanel-menuitem-padding: 2px !important; } I attached Firefox with white colored Title bar and Waterfox with colored title bar for example. Is there some setting in the about:config I am missing that was changed from 132 to 133 version? Thank you very much Vernon

I do not know what exactly causes Firefox (on Windows 11 anyway) to block the copy and paste functions, but i found the easiest fix possible :-) Firstly, for me it never grayed out the copy option on right mouse click, so it seemed like copy is possible - just that it did not copy anything at all! The CTRL / C also did not copy anything - but in MS Edge everything worked just fine.

I had cleared out the browser cache in FF - did not change anything (but maybe i should have closed FF and reopened it anew and things would have worked again - instead i got frustrated and used CCleaner to clean out the online trash in all browsers etc. But CCleaner also had a hickup due to some nag popup for their paid version, so i turned off the laptop and restarted it anew, then CCleaner ran normally, cleaned up all www garb.

Now i opened FF - and guess what, copy and paste worked just fine again.

Go figure what the cause was / is, but a www trash clean pc seems to solve it, that's at least something.

I can#t even begin to think where i should have best posted this question, but here it is anyway: Yesterday (or the day before) i activated the latest FF update (using Windows 11) - and now, today, i notice no copy and paste function for nothing anymore! Nada! What on earth is going on please, and more importantly, how can i fix this (or how can FF fix it if they screwed up the latest update)??

At first i thought it#'s only on Gmail and G translate, but after a while it became clear it's completely disabled. So i opened my backup browser, that Chrome base Edge browser - and see there all copy and paste actions work like normal.

Need a fix for this, otherwise i have to switch to that Microsoft browser, that would ba a truly sad day :-(

hi

i wish to create file configure (users.js), i will add lines for my choose, and i create file sh (bash command) for installing new user (login Lightdm) example user: kiosk-01, autostart to firefox -kiosk file:///index.html this is works but i need add new configure for new user of firefox and new user login lightdm.

file users.js : where i will install? maybe /usr/lib64/firefox/browser/defaults/preferences/ (here file)? or overwrite to file firefox.js or other solution?

other thing: i will write here the list of preferences for disable stuffs for kiosk, example:

disable check browers,

disable all warn for quit, new tabs, etc etc.. later i will write the list for KIOSK ok?

for now how i add new configuration for new firefox profile for new user login..

thank you

What has happened to the "More actions" menu button - the one that normally is in the upper left corner of windows (see the attached image)?

I have just installed a new PC, with Debian 12 and KDE (plasma 5.27.5); the other windows have this menu button, but not Firefox and Thunderbird. Is there a way to get it back, eg by moving the menu bar out of the title bar and back to where it used to be?

I use Firefox with navigation bar hidden in Linux Web Apps (in Linux Mint > Web Apps :: where you can create apps from any web page). I particularly use Notion as an app. And recently, I guess with the new updates, there is showing an address bar where previously there was nothing. Is there a way to remove it?

Thanks for your help.

W11, FF set as defailt browser, installed from Mozilla sites (.exe)

Any links from Whatsapp or Messenger app (and some others, but it is very likely the same issue) open in MS Edge. I found some WI to change the "microsoft-egde URL" default app, but I do not have that option. Only Edge is offered or I have to go to store and Install FF from there. Is there a way around it? My main concern is I am biuit scared to install it from MS Store as there are for sure some limitations and I might loose my opened windows and tabs...

Out of nowhere I got the sidebar today. An absolutely useless feature that I surely did not ask for. And there is no way of closing or removing it. Please provide a guide, to removing or hiding it PERMANENTLY!

Hello, I just updated my browser to version 133.0 and there was a pop up window that showed something about a review checker. I click on the link and read all about it. On a amazon web page I clicked on a review but did not see the price tag icon anywhere. I looked at my settings and could not find anything relating to the review checker. Is there something I need to enable or disable in the settings? Any help would be very much appreciated. Thanks, Rico

I am currently using Microsoft Edge and am looking for a new browser to use. I went through the trouble twice now in setting up Firefox the way I want to work and for it to open certain bookmarks every time I open it. But 2 times now I have closed Firefox and reopened it and each time it not only fails to open the bookmarks I have setup, it also loses the other settings I setup and acts like I am setting it up for the first time. If I can't get this problem fixed I guess I will start looking at other browsers.

Thanks, Mark

Since 113 I have had tabs BELOW the Bookmarks toolbar i.e. at the top of the "blank" screen area.

133 has now regressed my setup, back to having tabs above the address bar. This is a bad move, as it means that once again the screen content of a tab is separated from the tab by two bars, Address and Bookmarks.

Can anyone point me to a setting or a userChrome code block that will put the tabs below the Bookmarks bar, as the css now no longer works as it stands on 133?

I'm happy to set the sidebar to vertical tabs since I can get the maximum browser area, but there's one annoying issue: there's no close button in the vertical tabs, I have to right click and tab and select close the tab

the close button shows when I change back to Horizontal tabs, hope development team can improve it soon.

I am using FF on Debain 12 and have downloaded 131.0.3.tar.br2 sha256: fcd1e93221074a7b44445a99d81ea26e95fdc4c7e67000e748dab93cb12c2a13 I then did an update from the FF itself which brought me up to version 132.02 and I noticed that the container tab was missing.

Another Debain 12 workstation running 131.0.3 has the contain tab option.

Has the container tab been removed?

How do I turn this odd feature that dims FF bars when window loses focus? As of look of it only tabbar and toolbar are affected. I couldn't find anything relevant under "about:config". Also some tricks with CSS didn't work for me, maybe because I have custom chromeCSS that brings tabbar under bookmarksbar and applies other customization so that FF window looks like old good FF before they started to put everything on a single line in the bar. Thanks in advance.