Firefox Community Forum

With FF 140.0 on both WIn10 and WIn11, new tabs opened automatically then closed after less than a second. Initially I thought this was due to malware, but on inspecting the History, I found the source of this annoying behavior:

// SidebarUtil.tab.js

// This is just a placeholder file to be loaded in a temporary tab to check if a sidebar is open and how wide it is.

Is there a way to STOP this sidebar checking with its tab opening/closing without disabling Java entirely ? Is this annoying behavior really necessary in FF ?

Version/OS: It happens across multiple Firefox versions, currently 140.3.1esr (64-bit) I should not use latest version because it is not recommended. On my Debian Linux 13 i recommended to install packages from a stable repository.

Issue: when i type some phrase into address bar to search for it, it opens a search engine homepage https://searx.rhscz.eu not search results page. I have added the SE to FF by visiting its search page, click address bar, empty it, click drop-down menu, select currently opened SE.

When I try the same search process using address bar for the second time and onward, then it opens search results page correctly. I think that this issue happens only on 1st search attempt since browser start.

Hello everyone,

Is there any software that allows software developers to see what the CSS they are creating is doing in real time ?

Because I can't imagine they're doing it blindly. I see some CSS files that have hundreds, possibly thousands, of lines.

If there is software that helps them see immediately what their CSS is doing, can it be used to create extensions (add-ons) for Firefox ?

Thank you for your attention.

https://support.mozilla.org/en-US/questions/1491135 2/5/25, 11:25 AM

Please change the switch in your code back to normal. Its just a tiny switch! normal is=task bar context menu by right clicking on the task bar WITHOUT "title bar". Is this so hard? And why is such important thing not fixed in 7 months?

I don't know what you're doing but EVERYTIME I do an update lately, something goes wrong. Today after update, my STGs are affected and ALL ARE GONE. I do NOT believe this is their fault. And you put this dang auto Startpage when launching window, I did NOT ask for that. I am so pissed, how do I get them all back? I had things I was working on that were very important. What else did you add to FF that I don't know about? I don't want your updates anymore. You screwed me big time. And I don't want the extensions YOU think I should have: Google, eBay, Bing, etc. wasting my space. I'm not the only one either, seen lots of complaints.

HOW DO I GET THOSE TABS BACK??????

Translation feature is not working here: https://yoyaku.ariake-ferry.com/ReservationSelectDay.aspx

Even though it is working perfectly fine on their homepage. Hopefully Mozilla can fix this.

In the mean time: how can I *force* the translation feature to appear?

I tried to reach the following adress: https://www.itu.int/harmful-interference-to-rnss/ and I received this message on my browser: 400 Bad Request -Request Header Or Cookie Too Large

When I tried from a different browser it was accessible.

After tinkering with about:config (shouldn't have...) the background of every page that does not specify a body background color turns the color of my theme background color.

Using the firefox color pipette says its white, but it clearly isn't.

The theme i have is dark, making any page that expects the background to be white unreadable (without DevTools -> Body -> background-color: white)

I haven't been able to find the config that fixes it.

Hello everyone,

Listen, I don't understand. I just asked the question, it was published, but once I closed my account, it disappeared.

1 - I would like to disable updates for a specific add-on. Do you know how to do this ? I couldn't find anything in the GitHub help files for commands in Policies.json.

2 - I have another question, in case any of you happen to know the answer. I want to put “my lists” in two columns in µBlock Origin. CSS isn't working for me anymore.

CSS on Reddit

Thank you.

I received this download from Firefox today, July 22, 2025: xRqj7qhl.html - Size: zero bytes - Kind: HTML text . I've never experienced this before. Is it legitimate? Thanks

So i've lost access to my email on. my old mozilla accounts and upon logging in on a new device im being asked for a code to the email which i don't have access to anymore is there a way that my info can be synced to a new one. Thanks

im using firefox on windows11. youtube does not load and says no internet connection but other websites work fine. i tried syncing time udating the browser and checking DNS. Still not fixed. What else can i do

Hello, FF support forum,

I think I have seen a Container retain my login to a site when I open it again after closing it. Is there a way to configure Containers so that they are mini versions of the dump-cookies-temp-data when I close Firefox entirely? I would so love that functionality.

Regards, G.W.