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I'd like to try out the built-in VPN, but can't find it. I've seen many older posts about this, but nothing recent. It's now August of 2026.

I'm using Firefox 154.0.1 on Android 16. I'm in the United States.

I'm logged into my browser with my Firefox account. I know it's working as I can open browser tabs between my mobile device and other devices using my account.

I'm not seeing the built-in VPN feature.

"VPN" does not appear in Settings as described in https://support.mozilla.org/en-US/kb/mobile-android-vpn

By comparison, attached is a screenshot of what I have in Settings > Privacy and Security.

Any guidance?

About two months ago, after various Windows and Firefox updates, I can no longer make Firefox the default browser. In Windows Default Apps the only option for FF is to make it the default program for Adobe Acrobat Document. Choosing Make FF Default through the browser does not work either. Additionally, I’ tried numerous suggestions, using AI help offered by both FF and Chrome, without success.

The OS is not allowing me to make Firefox the default browser. Is there any way around this?

Any suggestions?

Firefox: 155.0.1 (64-bit) Windows 11 Pro Version: 25H2 OS build: 26200.9278

Thanks

In Firefox on my Android phone, when I type about:config in the address bar and press Go, it takes me to a description of that functionality, not the configuration page. I have tried DuckDuckGo, Chrome, and Bing, and they all do the same thing. How can I go to the about:config page?

My Firefox version is 152.0.5 (Build #2016171143). My phone is a Galaxy A32 5G, model SM-A326U, Android version 13, One UI version is 5.1.

I wanted to use the new VPN feature and the icon initially showed up in the top right, but it has disappeared and is not present in "customise toolbar" or privacy settings either.

After a power outage I now get this message on all three of my computers but only on some accounts:

"An error occurred while sending mail, The mail server responded: <1234@roadrunner.com> sender rejected. The email address you are sending as must match the email address you used to auth. Please check your SMTP settings, AUP#Out-1500. Please verify that your email address is correct in your account settings and try again."

I know what that means but I'm very confused because I use and have always used ONE <default> smpte for all my accounts and never had a problem until now. Thunderbird even gives the user a choice of whether to use one default account or separate smpte password statements for each account. I still can't send when I try to enter separate urls and/or passwords for each account. Anyone know what's going on? Thanks, Joe

I need my reply to a message to be displayed at the top of the conversation. How do I change the current sequence?

Will really appreciate some assistance....I'm a new user!!

Hi all,

I tried to change the appearance of thunderbird using a userChrome.css file.

• I am sure it is located in the correct profile folder and has the correct name userChrome.css
• The userChrome.css file is also visible in the style editor of the development tools and displays the correct contents if I edit the file.
• I am sure that the toolkit.legacyUserProfileCustomizations.stylesheets is set to true
• I restarted tb millions of times

The contents of my userChrome.css file are currently (but I also played with different content):

/* Change background color for read messages */ treechildren::-moz-tree-row(read) {

   background-color: #f1f715 !important;  
   color: #6564cf !important; 

}

In the style editor, if i try to change the color code in one of the lines, it gives the following error messages:

Error while calling actor 'stylesheets's method 'update' document is null Actor.js:103:13

   writeError resource://devtools/shared/protocol/Actor.js:103
   handler resource://devtools/shared/protocol/Actor.js:242

InvisibleToDebugger: TypeError { } Actor.js:110:15

   writeError resource://devtools/shared/protocol/Actor.js:110
   handler resource://devtools/shared/protocol/Actor.js:242

I am running thunderbird 128.3.1esr (64-bit) on mac sonoma 14.6.1 (23G93)

Does anybody know how to get the style sheet running?

Thanks, ulrike

Using 148 on Debian trixie I do not see the option for "refresh browser"?

https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Does it still exist or is there an alternative ?

How can I configure questions so that responses might be useful? I am specifically looking for time choices e.g. current, last six months, this year, etc.

It is November 2025. Answers for 2015 are of no use with all the changes and updates since in the past ten years.

I'm new to Thunderbird so this is pretty basic I know, but? I want to set the font style, size, and (color although that doesn't seem to be an available option) and make them my default for all newly composed emails. Any help will be appreciated. Thanks.

Firefox on my 2018 MacBook Pro started having issues downloading all file types after I disconnected Dropbox sync and backup. Each time I try to download a file, a failed message is displayed below the file name and type. The browser was using the downloads folder that was synced with Dropbox. After disconnecting Dropbox, I tried changing the downloads location, but the "Choose" button does not display a window. The result is the same whether the Always ask you where to save files is checked or not.

I have gone through the following steps trying to resolve this issue with no success.

1. I have reset/cleared any configuration setting found using about:config and browser.download.
2. I have launched Firefox in troubleshoot mode and tested downloads with no resolution.
3. I have uninstalled Firefox and installed a fresh copy from mozilla.org with no resolution.
4. I have set the downloads folder in Safari, but this did not provide a resolution. Downloads work as expected in Brave and Safari. The current downloads location is the Downloads directory on my iCloud Drive.

The second screenshot with the error attached in still referencing the Dropbox-connected Downloads folder. No other browsers are using this folder and the Dropbox app has been completely removed from my laptop.

I use Firefox for web development and need to be able to download various files throughout the day, so this has become very frustrating.

Any help is greatly appreciated.

Cheers,

I searched how to disable any random new AI features Firefox was about to cram into the browser.

I was served this support page that says I can "Block new and current AI features (single switch)"

Simply, the described feature to disable AI features isn't in the settings. I've look and tried searching for "Block AI enhancements" & "AI controls" but no luck.

Please tell me they haven't given the writing of support pages to some shitty LLM.

In the article https://support.mozilla.org/en-US/kb/install-firefox-linux#w_install-firefox-deb-package-for-debian-based-distributions-recommended

https://packages.mozilla.org/apt leads to 404, not a Debian software repository / archive.

Step 4 (is broken)

Next, add the Mozilla APT repository to your sources list:

echo "deb [signed-by=/etc/apt/keyrings/packages.mozilla.org.asc] https://packages.mozilla.org/apt mozilla main" | sudo tee -a /etc/apt/sources.list.d/mozilla.list > /dev/null

I just updated Firefox to version 135.0 on my mobile and now I get this really annoying thing:

Everytime I open a tab to go on the YouTube website, it asks me if I want to leave Firefox and use the YouTube app. Every single time. And it even launched it once without asking me.

I don't want to use the YouTube app, how can I make this stop?

Have a good day!

I am running thunderbird version 128.1.0 esr 64 bit. Right now thunderbird opens the email links to google chrome. How do I change thunderbird to open to Microsoft Edge browser?

Hi,

I switched today from 115.16.1esr to 128.4.0esr

And now there is more whitespace between the folder-lines in the Folder-Pane. The font-size seems to be unchanged. As I have very long folder-lists, this is very annoying as they are now even longer to scroll.

Actually I can switch between those releases, meaning I can compare any suspected change.

How can I reduce the whitespace back to the size I had before ?

Thanks

PS: I really don't understand why this was changed for existing profiles.