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My font on some sites is being forced to this horrible condensed font and it's seemingly nothing to do with my font settings in browser. Thing is, I VAGUELY remember changing a setting SOMEWHERE to actually do this, but it's not the main font setting in accessibility. Furthermore this issue has only started happening in the last day or two and my vague memory of setting my font somewhere was years ago.

Is there any other setting in Firefox that affects default font for certain sites?

[Images attached from terraria.wiki.gg in a normal tab (with bad font) and private browsing tab (with the font it SHOULD have) for comparison]

Hello,

My Win 11 Home (ver 25H2, OS build 26200.9168) Dell laptop runs Firefox v. 155.0 and doesn't load costco.ca however my iPhone 15 Pro Max running Firefox v. 154.1 does. The laptop's browser initially loads the costco.ca landing page (for 1 second) then displays a white screen with this message: "Application error: a client-side exception has occurred (see the browser console for more information)."

What can I do to enable Firefox to load Costco.ca on my laptop?

Thanks,

Steve

Logging in to Twitter/X is no longer possible as of a couple of days ago. After entering the username, pressing the "Next" button does nothing. Using the Desktop or Mobile version of the site makes no difference.

I'm encountering some UI errors with the last couple updates. With an update from a couple weeks ago, I noticed when viewing PDFs in the browser, random characters would be invisible, and in Google Sheets I'd notice some cells appeared blank, though selecting them showed that there was text inside. I also noticed disappearing text in a Google Doc I was working on. Now with the update that was just released today (154.0) all PDFs, and entire screens in Sheets and Docs, and other random graphic elements, are showing up as just flat black (see attached screenshot). My job involves working with spreadsheets and PDFs a lot so this is severely impacting my workflow, and I am reluctantly working in a different browser today.

I did a browser refresh, and then I uninstalled and re-installed, and that didn't help anything. What should I try next?

I should note I am using Firefox on Windows 11. I am not experiencing any issues with Firefox on iOS or Mac OS.

Edit: I was able to troubleshoot and fix this by disabling hardware acceleration under performance settings. Problem solved!

I have had a bit of a problem with a keyboard today and tried downloading drivers and reading faqs about it, and apparently as of today (august 20th 2026) firefox decided that most sites are unreachable (which they clearly are since the laptop running win11 works) Why the sudden overstep? BTW I can't access this page on the win10 computer.

images, text boxes dropdown menus and anything of the like reload the moment i scroll even slightly text boxes and dropdown menus dont reload text or option chosen just the image/ box no clue what could be causing it doesn't appear on mobile just PC. appears when searching with duck duck go and google also reloads when moving over images and a good chunk of the time only loads them partially/ flickering, not unusable just annoying thanks

The "Developer Information" link in the "Developer" section of the release notes page - https://www.firefox.com/en-US/firefox/153.0/releasenotes/ - for Firefox is broken as of v153.0.

1. It attempts to open: https://developer.mozilla.org/docs/Mozilla/Firefox/Releases/153
2. MDN shows a 404 message, and offers a "153" suggested search link which eventually gets me to https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/153

I have not tested this for other regions, but without the "en-US" (and possibly other "language-CountryCode" flavors), the link in the Firefox release notes page will not open the Developer release notes in MDN.

Could be an MDN configuration issue if it's not a problem with how links are generated for the Firefox release notes page.

Let me know if I can provide any additional information. Thank you in advance if this issue is fixed.

I can't get into my gmail My gmail icon disappeared from my icons screen a few days ago. I had to get into my email by going into Firefox. Now that isn't working either. I decided to make Firefox my browser, so I did that. Now what do I do? I still can't get into my gmail!!!!!!! Please help!!!!!! NOW

When I select a YouTube home page video mute icon, for sound on a preview, it pops up a mini-player, a notice that I have "saved to watch later," or toggles the mute as expected. Intermittent and unpredictable. I can select one mute icon that toggles the sound, and the preview beside it pops up a watch later.

Win10, Firefox 152.0.6 (64-bit) today, but this has been with me about the last two iterations.

I ran though eleventy-billion experiments and there was no effect from any toggling of settings, add-ons, file deletions, toggled logouts, forced refreshes, you name it. The single positive is that the keyboard "m" works fine to toggle mute in a video page playback, but not the previews at home. I followed AI advice after I gave up on my own ideas, and after recommending everything under the sun the only conclusion offered was related to failed mouse tracking, which is nuts to me. Everything works fine except this YouTube oddity, including videos or sound output on other sites. I was actually surprised that nothing changed YouTube behaviour after my freaking out on FF details; doesn't mean the trick isn't in there somewhere.

In simple terms, I have not read reports of this problem and I have no idea how to proceed.