Firefox Community Forum

Why isn't this happening when I open PDF files? Usually, there's an option that lets me choose between opening it directly in Firefox or using my PC's default app (Foxit Reader), but it keeps opening directly in Firefox instead.

Hello! Randomly this week my Youtube switch UI to something more similar to a TV version. All video details and setting are hidden, below a video are other videos, and there is no access to comments or like/dislike. I thought the site updated, but from mobile (both app and Firefox browsing) the site is as I normally expect. I opened safari on desktop and again confirmed Youtube seems "normal".

Does anyone have any experience here? Did I accidentally switch on a protective setting?

Thank you for the help!

I use Bookmark Toolbar a lot. It has several menus, with submenus. But when they layer over top of each other, I get lost in which layer I am on and too often my mouse moves off the top layer, which closes it.

I would like to somehow change the colour of the menus, depending on the layer. Currently they seem to all be kinda grey, regardless of theme.

But if the first dropdown menu could be yellow and then the next be blue ... or whatever, it would be most helpful.

I suspect this is something that could be effected in userChrome.css, but I have no idea what to put in there to target the menus.

Any help or guidance you can provide is much appreciated.

Thanks!

Firefox 157.0 is displaying some websites incorrectly. Newsmax pages turn white and McMaster-Carr is also displaying incorrectly such that I cannot make an order even if logged it. The same sites work correctly in Edge which I have an intense dislike for. I have already restarted Firefox and rebooted Windows. This started after the Firefox 157 update.

I no longer see my LastPass password manager on FireFox. I'm using an IMAC Retina, 5K, 27", 2017, Ventura 13.7.8. It's always been at the top of the page. What can I do to bring it back?

Hi, I'd like to remove the rounded corners ( they are too big) everywhere in the Firefox browser. The suggestions I've found online aren't helping me. Do you have a solution for beginners?

Hello,

I have had an issue for a few months now where certain websites fail to load. This is most easily reproduced on https://addons.mozilla.org, where I am shown the error "An unexpected error occurred" on most pages, preventing me from installing addons.

This issue does not occur in a Private Window, in Troubleshooting mode or in Chrome or Brave, but persists in fresh installs of Firefox. In troubleshooting this issue, I have removed all program files, registry data, and app data pertaining to Mozilla / Firefox. In fresh installs, I can sometimes install an add-on or two before this error starts occuring. I have not imported any previous data.

I was previously installing from Chocolatey, but in my last clean install, I downloaded from the official website.

I am on Windows 10 and Firefox 157. I use Proton VPN (Paid) and have tried changing servers several times to no avail. Again, this only happens in Firefox in a standard window, Private Mode and Troubleshooting Mode are fine.

Screenshot 1 shows the issue from my most recent reinstall. I was able to install 1 add-on (SponsorBlock) before it started showing up. Removing the add-on doesn't fix the issue. Trying to access addons.mozilla.org via a search engine results in the tab icon loading for a second and no change happening on screen (Screenshot 2).

I experience similar issues on other websites, like trying to log into Bandcamp.com (logging in gives the error "There was a network error. Please try again."), but most sites work.

Loading https://addons.mozilla.org/en-US/firefox/ gives the following results in the Network Console:

Uncaught (in promise) TypeError: can't access property "pressed", target is null

   onChangePermissions chrome://mozapps/content/extensions/components/addon-card.mjs:893

addon-card.mjs:893:7 Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect Reporting Header: invalid JSON value received. collect

I browse exclusively with Firefox on a Windows desktop. Edge is installed but unused. Even so, Firefox unpredictably starts as many as seven Edge Webview2 processes, which invariably bog the computer down. (Webview2 pops up only when I use Firefox and usually when nothing else of consequence is running; so Firefox seems the likeliest culprit.) Microsoft says that trying to uproot Webview2 will disable many apps and may end civilization. How can I prevent Firefox from invoking Webview2?

My Apple desktop crashes frequently in different applications (while in gmail, on Facebook, etc.) and it sends a report to Apple every time. It never does it if I use Safari. If I can reload Firefox to fix it please let me know how to do that. Thanks.

cant get rid of stupid thing that comes up saying i have a virus so i buy some stupid anti virus crap i dont buy things oclick here to remove it but it doesnt what kind of scam is this so i buy somethingn line says system alert

Yesterday (10/1/26) Firefox went through SEVERAL updates to v.157.0. Now, it behaves extremely buggy and locks up if I try to open more than one window. It was never this pathetic! I want to revert back to the previous version. Yes, I am running Win10.

Also, now it will not even close properly. I have to go into program manager to kill all of the subprocesses that have spawned. I DON'T LIKE THIS VERSION AT ALL!!!!!

I'd like to request a refund for the Mozilla VPN I paid for. My Last bill was on September 25, 2026 in the amount of $59.88 + $3.83 tax. I won't really be needing it and I am OK with the built-in VPN on Firefox. I am within the 30-day money-back guarantee. Thanks.