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For years, I've been using FF on desktop (Linux), tablet (Android) and phone (Android - Samsung S24+). Sync has never been a problem until two weeks ago when FF on the phone has either refused to sync when I tapped the command, or hasn't synced for many hours or sometimes days (which is why I tried to do it manually). So, I signed out of my FF account on all 3 devices and then signed back in. The desktop computer and tablet are syncing normally, but the phone still won't sync. When I tap the 3-dot menu on the phone and then my name, it says the phone has NEVER been synced and tapping the sync command does nothing. Under "Choose what to sync", all options are checked, but greyed out. Can't change them, in other words. When I access bookmarks on the phone, it properly shows what was there before the last sync. The phone is running FF version 150.0 Build 2016155439

Help!

Content Security policy blocks essential scripts no matter what I do.

It's new Firefox installation, Troubleshoot mode, Enhanced tracking disabled, I'm not on VPN, can log into X.com in another browser just fine.

It's the reason #1 I don't use Firefox. I thought the issue would be fixed but it has been like this for long time.

Yet whatever I do, whatever I turn off this pops up:

Content-Security-Policy: The page’s settings blocked the loading of a resource (default-src) at https://abs.twimg.com/responsive-web/client-web/bundle.Conversation.721fc4aa.js because it violates the following directive: “default-src 'self'”

The screenshot is from Zen, but it uses Firefox and the issue is the same in Firefox.

I downloaded Firefox today and saw there was a VPN option but it is not working. It asks me to sign in and per the instructions the clickable icon at the top should now have an option to enable but it just asks me to sign in again. I am from Canada and it says my region is available for this program.

As of last week, FF works for a few minutes on startup, but then when you open a new tab and try to go to a site you just get the dancing period, nothing opens. Already open tabs with sites generally still work, but sometimes crash the tabs after a bit. We've tried starting without extensions, uninstalling and reinstalling FF, changing the profile, logging in the PC (Win 10, up to date) with a different login, running SFC and DISM on the PC, and just about everything else.

Opening the FF console shows this message when the tab just rocks the period:

WindowsJumpLists: Failed to fetch favicon for https://online.adp.com/signin/v1/?APPID=WFNPortal&productId=80e309c3-7085-bae1-e053-3505430b5495&returnURL=https://workforcenow.adp.com/&callingAppId=WFN&TARGET=-SM-https://workforcenow.adp.com/theme/admin.html NS_ERROR_FAILURE: WindowsJumpLists.sys.mjs:257:29

Edge works perfectly (and unfortunately, I'm having to use Edge to enter this ticket.). Other applications don't have any issues. I'm not having this issue on 2 other similar PCs I have that run FF, only this one.

Any ideas of what might be the issue with FF on this PC? Thanks, Alex

helloooo

i am experiencing an issue with firefox where backup (Firefox Backup) is not working since version 148.0

problem: - when I try to create a backup, i get the error: “Hmm, there was a problem with the backup. Please try again in a few minutes.”

what I have already tried: - enabled and disabled backup password - changed the backup folder/location - cleared browser cache - tested across multiple updates (issue persists)

- backup is enabled, but I cannot create one - the error occurs every time - restarting the browser and system did not help

After I open an email and/or reply to it, the alert stays on at lower right. I read a great many emails every day at work and having to turn off the alert manually wastes time. How can I set the alert to go off when I've read a new email?

We have an asp.net Blazor SPA (server side Blazor) that dynamically generates components within the page. Over time, there is a very large RAM leak under document-shared that climbs until the windows are closed.

We have tried various firefox configurations to try and either disable this shared storage as well as limit but with no luck. THe memory allocation is in GB of RAM space and cannot be limited or reduced until the window itself is closed/restarted.

Research online indicates this can happen due to colocated stylesheets and how firefox wants to cache styles aggressively. Adjustments to move stylesheets does not appear to help.

What configurations can I use to help prevent/reduce this high RAM usage? This does not occur in Chrome or Edge, I cannot replicate this well under FireFox for Windows.

When I select a line of text, normally it would get deleted/overwritten when typing a new line of text, but when I select text in Firefox and begin typing again, it simply deletes the first word in the selection and keeps the rest. Is there a setting to have ALL text selected deleted/overwritten when new text is entered? Selecting one word overwrites the whole word but when an entire line to be deleted is selected, only the first word is deleted and typing begins where that word ends.

I am trying to move one tab from one window to another. It says I should be able to move it just by clicking on the tab and dragging it to the window I want to move it to. But, when I try this nothing happens, it won't move.

Want can I do to resolve this?

Thanks

Hi

I've just booted my machine and opened Firefox, only to be presented with a completely fresh install.

All my settings, bookmarks and history gone. It was fine yesterday when I closed it and powered down.

I'm running Kubuntu, I've checked the .mozilla folder and nothing...it's like my profile has just been overwritten.

Not happy at all, I'm starting to dislike Firefox.

Can anyone offer any help or advice please?

Thanks in advance.

I am the developer of FastF1, an open source Python package for downloading and analyzing Formula 1 race results, timing data and telemetry. The package is widely used in the fan community for independent analysis of results. For some advanced features, the addon requires users to authenticate with their Formula1/F1TV account. Since their services don't have an open login API, a companion addon is required to allow users to sign in using their browser and the official website.

I have just noticed that my developer account has been banned and the addon was blocked in Firefox. I have not received any email about this and don't know why exactly this decision was made. I'd like appeal this and reinstate my account and the addon, but I don't know how to proceed from here.

FastF1 and the companion addon are fully open source and intend no harm to users. https://github.com/theOehrly/Fast-F1 https://github.com/theOehrly/fastf1-companion

I hope this problem can be resolved.

I met the same problem as https://support.mozilla.org/en-US/que.../1191123

I have read this https://support.mozilla.org/en-US/kb/forum-response-firefox-sync-verifica...

I have tried waiting for more than 24h, not working, and submitted a request at Bugzilla (maybe it's because I didn't write the request in the right way so I haven't got response yet).

I have some so many bookmarks in my firefox account and passwords in my lockwise account. Please help me out, my account email is xxxxxxxxxx@xx.xxx

(email address phone number removed by moderator; please do not post personal information on a public website)

I have to reload history, bookmarks, passwords each 3 - 4 days, when Firefox refreshes the software. It was not happening before, just in the last two moths. How can I fix it?

I am experiencing an issue where my saved Collections are not appearing on the Firefox Homepage (New Tab page), even though they clearly exist in the system.

The Issue: When I attempt to add a page to a collection, the "Select collection" overlay correctly shows my existing categories: Read Later, News, and Gemini.

The Discrepancy: When I return to the Firefox Homepage, the Collections section is completely missing. Only "Shortcuts" are visible.

Troubleshooting done: I have verified that I have active tabs saved within these collections (as seen in the attached screenshots), but the homepage remains empty below the shortcuts.

Device Specifications:

• Firefox Version: 150.0.1 (Build #2016157687)
• Build ID: 094f3362dcbcefdce34f05b355607cdce06a4ef4
• GV: 150.0.1-20260427013024
• AS: 150.0.1
• OS: Android 16

Moderator note: This question has been edited to specify values in the "Firefox version" and "Operating system" fields based on the info above.

Hello! I appreciate many niceties of the 148 update, but i'm having an issue resulting in many more tabs on Android mobile than I usually generate. When I search something and then want to sesrch the same query again using a different search engine (by selecting a different search engine from the tab bar menu) a new tab opens, leaving the query via the previous search engine open, and the current query of the current search engine in a new tab with focus. I'm aware that this behavior can be modified on desktop, but there is no such setting for android.

I would really love for this behavior to be reverted or optional, as it's made it so I need to clear out many tabs of duplicate queries (on different sesrch engines) and it makes me avoid using the built-in search engine switcher to prevent generating more tabs :( (which sucks because I have like 10+ custom searches and they're very useful!)

When I logged in this morning my FireFox screen had changed. The window for searches had disappeared and the "pocket" selections were all about India and its events. None of the previous options were there. What happened and how do I get back to where things were?

Robert Blackstock

I saw the update that you added vpn to firefox, but I can't use it. It doesn't show up in the toolbar anywhere and there are no vpn options anywhere in settings. When I try and create a second profile THEN I get the vpn option but when I click on it it says that I can only use it with the original profile.