Firefox Community Forum

Have an app with a web interface that I used for years, but not with several of the latest versions of FF. Chrome, Edge, and DuckDuckGo all show the page as expected and the page functions properly.

URL: http://127.0.0.1:8384/ Error looks like this:

Unable to connect

Firefox can’t establish a connection to the server at 127.0.0.1:[port number].

   The site could be temporarily unavailable or too busy. Try again in a few moments.
   If you are unable to load any pages, check your computer’s network connection.
   If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the web.

Have tried a large number of things including:

Ping works for ip and hostname, v4 and v6 Confirmed address is accessible through other browsers Disabled extensions Added exceptions in Settings for HTTPS-only mode Various settings in about:config, careful to return them to previous states when they didn't fix the problem Tried Safe Mode (aka Troubleshoot Mode) Refreshed Firefox (as prompted before uninstalling)

My last step is to reinstall, but thought I'd ask here first. Has anyone seen this before?

[edit] I was using my phone to post this question and inadvertently posted it to the android forum. This is a DESKTOP question.

I'm trying to sync my tab groups across my desktop/laptop. I have sync enabled through the settings and I've checked every box, but I don't seem to see an option for syncing tab groups specifically. It syncs all of my bookmarks and active tabs, but the groups seem to be unique to each device. Is this feature available? I might be looking in the wrong spot so if anyone has any insight that would be great! Cheers

After I restarted my Windows 11 last night at 6:38 EST, Firefox updated to 139. I lost all my open tabs and history, and I've lost a day of work dealing with this. Help!

I have just noticed today that I cannot login to Reddit with FireFox. After researching the issue, I can confirm the following:

- Followed all steps in: https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems - MalwareBytes is not installed - Confirmed latest update of FireFox installed - Adblocker/Ublocker disabled - Deleted caches/cookies - Refreshed Firefox then restarted in troubleshoot mode from: Help > Troubleshoot mode > restart > refresh - Created a new profile and tested - Confirmed FireFox is not limited/restricted from accessing private/public network - Confirmed signing into Reddit from other browsers is successful

Please advise how to fix this as FireFox is my primary browser and I'd rather use it for all of my activities screenshot of the error message attached below

Decades ago, browsers had features to download the current web page along with linked pages and store them locally including updating the downloaded main page's links to reference the linked copies. It was even possible to specify how many link levels to copy along with the main page.

when web page sidebars became popular this became problematic for a while since sidebars often linked to ads or unrelated content (Wikipedia or GitHub for example). Then browsers started providing a means to disable webpage sidebars and display only the main page.

I can't find any of that capability in Firefox. I have searched the settings, extensions, Firefox support pages and found almost nothing related to simply saving web pages.

I fear that some day the website 'UESPWiiki' which provides support for my favorite game which is now (2025) 19 years old will some day go away. UESPWiki has side bars preventing simply downloading everything. Help.

Just updated to 139.0.1 and got a surprise. My New Tab Favorites Icons now have Push Pins in their upper left corners, leaving less space for the icons, so of course my icons are now smaller than before. Why do the people maintaining the system at Mozilla keep messing with the New Tabs? Last time, they thought they needed to include a large image of the Firefox icon, again shrinking the remaining screen real estate for my icons. That got fixed. Now they decided each favorite icon needs a rather large push pin to indicate that it belongs there. Somebody thought this would be a good idea? Why can't they just leave it alone?

I'm posting two screenshot images of my New Tab screen. You will know which is before and which is after.

Firefox keeps crashing and Hanging and I get the error message "gah your tab etc" I have followed the advice for fixing the problem but it keeps coming back Its really annoying when you are trying to do something I'm no computer whiz and I have looked at the crash reports, its just gobble gook to me, I need help to fix the problem.

When I go to view an already open tab it will sometimes randomly move it to the very end of my tabs all the way to the right. I don't want it to move tabs without my intervention. Clicking on a tab should keep it in place.

This has been an issue for about 2 months now. I'm not sure what's causing it or even if it's entirely a Firefox issue as I have noticed something similar happen in another program with tabs that I use often. It still seems like a Firefox issue in that moving a tab all the way to the end is a very specific task that can't normally be done accidentally.

Is there a way to prevent this from happening or has anyone figured it out?

This person has the same issue: https://connect.mozilla.org/t5/discussions/stop-reordering-my-tabs/td-p/93219

I'm running Firefox 139.0.1 on Mac Sonoma 14.7.1.

Since FF V138, I've had this extremely frustrating problem where, approximately once a day and while the application is still running, Firefox seems to either auto-revert to an older version' 'or otherwise mess up the installation files. I don't get any notice this is happening until I try to open a new tab and it brings up the "You must restart Firefox" notice. When I click Restart, it pops up with "You've launched an older version of Firefox, so you won't keep any of your bookmarks because that would be unstable" error.

The only way I've found to fix it is to redownload the most recent install files, which, after the fresh install, will allow me to keep using Firefox with my bookmarks for the next 5-6 hours, before the whole process starts again.

I theoretically have auto-updates off; my settings are set to the other option, "Check for updates but let you choose to install them". Doesn't seem to make a difference. It only does this on my Mac; the FF install on my Windows machine works fine.

I really want to keep using FF. It's my preferred personal browser. But this is really messing with me! I was hopeful that 139.1 would fix it but same issue, so far.

Whenever I close Firefox and try to reopen it, it brings up a system error that says, "The code execution cannot proceed because C:\WINDOWS\system32\pmls64.dll was not found. Reinstalling the program may fix this problem." I've tried completely deleting Firefox and reinstalling and it opens a new tab, but when I close it i get the same error message.

I am repeatedly getting this pop up window after starting my computer and selecting the Firefox icon in the toolbar to start the browser. When using the Firefox browser I always update Firefox when prompted, so it should be the latest version, unlike what it states in the popup window. If I want to use the browser, I have to sign in to the browser and sync my data and I have to re load all my tabs from my history. It is time consuming to the point where my colleagues who were using Firefox have uninstalled Firefox and are now using a different browser. I could do the same...but I want a solution. I'm using Windows 11.

Why won't Firefox open any new windows? I give ir the command to open a window and yet all i get are tabs and I never click on open a tab. I have an HP probook this for windows 10 and i am also having the same problem with Chrome. I have uninstalled and reinstalled chrome and that did not fix it so it is not that. What would cause this? I have already cleared the cache cookies history browsing etc. and nothing is fixing it. PLEASE HELP.

New update has affected the performance of Jun's Journey. Specifically, a white "mist" now covers all play areas of the June's Journey game. Wooga - the operators - advise it is not their issue. Others are experiencing the same since update

I cannot get past the secure connection failed! I have cleared cookies, cache, etc. I have turned off the firewall, and restarted my computer more times that I can count....

Hi!

Previously, all the sites saved in a single container could be accessed via the dropdown arrow to the left of the 'close,' 'minimize,' and 'maximize' buttons. Now, it only shows current tabs, tabs from other devices, close duplicate tabs, and add a tab to one of the containers. But how to open those containers is unclear.

PS I have the latest update 139.0.1