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I came to know about Firefox Widgets but can't see any on Firefox 152 on Windows 11 desktop. The option Allow Firefox to improve features, performance and stability between updates is already checked (Screenshot attached) as suggested by users.

Our team has already tried to fix the issue for a week now and none of the approaches seem to fix the issue. Does the Firefox dev department have any hints or clues for us?

Short description: Firefox network.lna.blocking blocks same-origin/loopback requests when the page is controlled by a Service Worker

Symptom: Login via OIDC fails in Firefox (the backend call after the IdP redirect is blocked). The error disappears if either network.lna.blocking=false is set or the Service Worker is disabled.

Environment: - Frontend (react) and backend run on the same machine (loopback/localhost)—no cross-network scenario. - Firefox with active network.lna.blocking (experimental Local Network Access feature, Chromium’s equivalent is Private Network Access).

Root Cause (Analysis): 1. apps/react/sw.js registers a global fetch listener via Workbox and calls workbox.core.clientsClaim(). This causes every open page to be immediately controlled by the Service Worker. 2. registerServiceWorker() is called unconditionally on every app start, regardless of authentication state—even on the login/OIDC page. 3. The app uses hash-routing (URL fragments like “#/oidc”); the login page and the rest of the app share the same document URL, so you can’t restrict the SW scope to “everything except login.” 4. Once a page is Service-Worker-controlled, every fetch—including requests not explicitly handled by Workbox routes—first goes through the SW’s fetch event (default behavior when any fetch listener is registered) before proceeding to the network if it isn’t intercepted. 5. Hypothesis: Firefox’s LNA implementation doesn’t correctly inherit the address-space classification (loopback/private/public) for SW-forwarded requests across the controlling client. A direct document fetch (loopback→loopback) is allowed, but an identical target fetch routed through the SW is blocked.

Reproduction (minimal): 1. Use Firefox with network.lna.blocking=true (the default in affected versions). 2. Load a page that registers a Service Worker with a fetch-event listener (e.g. via Workbox precacheAndRoute + clientsClaim()). 3. Ensure both the page and the target resource are served from localhost/loopback. 4. From the SW-controlled page, call fetch() against the loopback target resource → the request is blocked. 5. By comparison, the same fetch from a non-SW-controlled page succeeds. 6. Setting network.lna.blocking=false also allows the fetch to succeed under SW control.

Excluded Causes: - Different address spaces for frontend/backend (both are on the same loopback machine)—ruled out. - Misclassification due to redirect_uri or cross-origin navigation—the OIDC redirect is a top-level navigation (unaffected); only the subsequent backend call (token exchange/session validation in SsoLogin.tsx → ssoLoginSubmit) fails.

I've had a problem for a while where Firefox tells me "Firefox is being updated by another instance" and the only way I've been able to get updates is by using the installer.

In my attempts to resolve this, I learned of the `about:profiles`. I have never set up profiles so I figures I should only have the 1 default profile but it turns out I have `default`, `default-release`, default-release-1`, and `default-release-2`.

Of these profiles, the `default-release` is the 1 that has my data while it is `default-release-1` that is able to update.

I would like to make it so that I only have 1 profile that has all of my data AND is able to update.

I already tried removing all the profiles accept the one with my data but that leaves Firefox unable to update. I restored all the profiles I removed and I am back to where I started.

Does anyone have any suggestions?

bonjour,

j'utilise le VPN de firefox, j'ai compris ou trouver la consommation de données mensuel, seulement elle n'apparait pas dans la rubrique vie privée et sécurité des paramètres!

Hello,

I'm looking to customize the colour of the message header row (the part highlighted in red; with a black background as shown in the screenshot) to #202020, to match the rest of the elements of the view. While I've successfully managed to customize other elements (code below), I need help with identifying what to specify for the message header row.

.tree-table { background-color: #202020 !important; }

treechildren { background-color: #202020 !important; }

#messagePane { background-color: #202020 !important; }

#messageHeader { background-color: #202020 !important; }

#msgHeaderView { background-color: #202020 !important; }

Thanks and cheers.

Since Thunderbird update to Snap ``` 140.12.1esr (64-Bit) Mozilla Thunderbird Snap for Ubuntu ubuntu-snap-build - 1.0 ``` opening attachments ceased to work. What does NOT work (any more):

• Move mouse over attachment → right mouse → open (nothing happens)
• Move mouse over attachment → right mouse → open with (doesn't exist)
• Move mouse over attachment → doubleclick (nothing happens)
• Settings → Attachments → There is an empty box, and in the void beneath it, floating in empty space the text (backtranslated from DE): "Add a Filelink-memory service" or "Filelink-save service" or similar. The text is dead (not clickable), same for the empty box.

AFAIR, in the good old non-snap TB version, the box had file extensions and linked applications to open them. The box / links / extensions coud be added, edited, removed. But in snap crap it's all dead...

Any hints what I am missing?

I used to open attachments from received mails (like .diff, .patch), and also used it for final inspection of own attachments while composing mails.

Sometimes, the following message opos up: /run/user/1000/doc/1d06e601/binutils-sort-text.diff konnte nicht geöffnet werden, weil die damit verknüpfte Hilfsanwendung nicht existiert. Ändern Sie die Verknüpfung in Ihren Einstellungen.

I want to auto delete all msgs from a specific sender. I want to create a filter which will delete them so I won't see them at all (auto deleted). I tried to create one but could only move the messages frm the sender to the spam folder. But I don't even want to see them there. I want them gone automatically.

How do I do this?

Hello. I regularly sign up for online conferences, then when I get the confirmation email with the details I can't transfer it to the calendar. I even tried saving the ical event separately but when I try opening it using Thunderbird I get an error message. The only way I found is to transfer the contents manually and create an event on calendar, which is time consuming. Anyone knows how to fix this? Thank you in advance

Using the Firefox 151.0 Mozilla Firefox for Fedora. Updated as of 23 May 2026, I use just a generic FireFox. I don't customize it, I just use it as it comes from the Fedora distribution.

I cannot save images (right click menu "Save Image As"). Nothing happens when that is selected. This worked a couple weeks ago.

Downloads are supposed to go to ~/Downloads. Checking the setting for this, Go to the three-line menu > Settings > General > Files and Applications, under Downloads, the "Save files to" value is set to Downloads, but the Browse button does not work to reset it. Nothing happens when I poke on the button. I can select the text in the box, but I can't change it.

I found the help page for "What to do if you can't download or save files https://support.mozilla.org/en-US/kb/cant-download-or-save-files and went thru every one of the steps there. None of them make any difference.

Strangely enough, there isn't even a "Downloads button" in the top toolbar. If I right click on the top toolbar and select "Customize Toolbar" it shows a downloads icon as already being in the toolbar, but when I click Done, it goes away.

I've installed the 10.5.x version of Network on my Ubiquiti Gateway. I now have a problem accessing the gateway. However, this is weird. When on the local network, I can connect directly to it, no problem. Where the problem comes in is when I try to connect to it via unifi.ui.com, the web portal that Unifi Gateways connect to. I've tried a Private Window which is set to not enable any extensions. The results are the same. It will sometimes load part of the page, but never all of it. Before the v10.5.x Network Application update, this was not a problem. I've tried this on both a Windows 10 & Windows 11 computer with the same results. Everything works if I'm not trying to connect via the web portal from the local network. (i.e. If I'm elsewhere or use my cellphone's hot spot, I can connect to my gateway via the web portal without any issues.)

I would blame the Network Application update as the problem if it wasn't for one detail. It does work from the local network if I use MS Edge instead of Firefox. So, I suspect that while there was a change made in this update, there is also something that Firefox is blocking that Edge isn't.

Any ideas?

TalkTalk have outsourced their email to Everymail. We use Thunderbird as our e, Mail client on a pc. We have stopped getting email and can’t send any for a week now. Do I need to reset the server names suddenly.

When I try to enter the VA site (https://www.va.gov/my-health) it never opens (see attachment). I use my back-up browse (Microsoft Edge) and I can enter the site. Can you help?

Jerry Clausing Riverside, UT 84334

I sent an email a few days ago asking for a refund and a few hours later changed my mind, I couldn't cancel the ticket (as far as I know) so I sent a follow up email to disregard the first email because I thought it would just be more hassle and I think the VPN works fine anyway. Today I get an email saying my subscription had been cancelled! which I could understand is my fault for being indecisive in the first place and the last email I sent might not of been read in time, but the email that I had received also didn't state I would get a refund and seemed like an email I would get if I had cancelled my subscription myself stating "We’ve cancelled your Mozilla VPN subscription. Your final payment of US$59.88 was paid on 14/07/2026" Should I still expect to get a refund or was there an error with my request?

I've been using the extension "Tree Style Tab" and "TST Colored Tabs." I've been looking for a way to disable the native Firefox tab bar, whether on top of the window or to the left side. I haven't been successful on my own.

After a couple of hours troubleshooting this with CoPilot, It suggested I post the following short summary:

============

Firefox 152.0.6 (64-bit) about:profiles shows active profile: C:\Users\dmerc\AppData\Roaming\Mozilla\Firefox\Profiles\usm8kxcr.default-release

Opening that directory from about:support shows an empty folder.

profiles.ini references: agwp164m.default-release

userChrome.css loads correctly in a separate profile but not in the profile containing my current extensions and history.

============

The details of how it came to this conclusion:

============

Based on everything you've found:

The profile with your current extensions and recent history is reported as: usm8kxcr.default-release

Opening that profile folder shows an empty directory. The only other real profile on disk is: agwp164m.default-release

We successfully proved userChrome.css loads in a different test profile (Profile 1) because the toolbar turned red. Therefore, the CSS mechanism itself works on your machine.

My conclusion is that your Firefox profile registration has become inconsistent. Firefox appears to be using a profile that does not correspond cleanly to the profile folders you're seeing in Explorer. At this point I would:

Back up the entire folder: (NOTE: DONE - backed to to another drive) C:\Users\dmerc\AppData\Roaming\Mozilla\Firefox

Keep using the profile that contains your extensions and recent history. Avoid deleting any profiles or profile folders.

Post the details you've collected to either: the Mozilla Support forum, or r/firefox

The key facts to provide are: Firefox 152.0.6 (64-bit)about:profiles shows active profile: C:\Users\dmerc\AppData\Roaming\Mozilla\Firefox\Profiles\usm8kxcr.default-release.

Opening that directory from about:support shows an empty folder.

profiles.ini references: agwp164m.default-release

userChrome.css loads correctly in a separate profile but not in the profile containing my current extensions and history. \ Those facts point to a profile-management issue rather than a Tree Style Tab or CSS issue.

The good news is that your current extensions and recent history are still accessible, so this doesn't look like data loss. The profile mapping itself needs to be untangled before custom CSS can reliably be applied.

=

It also suggested not copying any folders and files between profiles for now.

Using the "re-open tab" function on a browser based discord instance changed a bunch of my settings, for one it turned on vertical tabs, added extra side bars to everything, and made every ui element animated. Ive figured out of how turn vertical tabs back off, and while I was writing this, I figured out where to turn off this stupid animated gizmo to select what I actually want, instead of directly bringing up my bookmarks/history. How do I stop a random website from overriding my settings in the future? If discord can do it through incompetence another website can surely do it maliciously and I really dont fancy this happening again. The "best" (and completely unrelated) I've found on how to undo this, let alone prevent it from happening again is pressing esc or f11 because of course everything these days has to drown in AI slop :/