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I reinstalled Firefox and imported my bookmarks from a .json file that I made on 5/19/26. Firefox imported them but I can only open a handful of them. I can't even open Google or Yahoo mail. One time I got a message on a page that didn't open that says "Please enable JS and disable any ad blocker." I don't know how to disable JS and Google won't open so that I can find out how to do it. I have no ad blocker running.

Please let me know how this can be fixed.

Denise

After the latest update, a website I use (https://compcon.app/) started throwing the following errors:

downloadable font: CFF : Failed validating CharStrings INDEX (font-family: "Helvetica Bold" style:normal weight:700 stretch:100 src index:0) source: https://compcon.app/assets/Helvetica-Bold-DaBjwqT2.otf downloadable font: CFF : Failed to parse table (font-family: "Helvetica Bold" style:normal weight:700 stretch:100 src index:0) source: https://compcon.app/assets/Helvetica-Bold-DaBjwqT2.otf downloadable font: rejected by sanitizer (font-family: "Helvetica Bold" style:normal weight:700 stretch:100 src index:0) source: https://compcon.app/assets/Helvetica-Bold-DaBjwqT2.otf

It can't load the font the website is asking it to use and is replacing it with a default one instead.

Do you know how to fix this? Either on my end or theirs?

I'm constantly getting error message like below for legitimate sites? Looks like there’s a problem with this site

The server at www.limbestateagents.co.uk sent back an error: 500 Internal Server Error What can you do about it?

   Check to make sure you’ve typed the web site address correctly.
   The site could be temporarily unavailable or too busy. Try again in a few moments.

I have always been able to use Firefox to login and place grocery order on the Kroger website. This afternoon the server will not let me in, saying access is denied. I was able to login from Microsoft Edge. Is the Kroger website blocking Firefox logins? I have been having trouble loading the website for the past month or so, but have always been able to get in. Does anyone have a fix for this problem? I rebooted my computer to make sure it was not my PC.

The email address box does not accept the email address and comes up with an error message. The only way to send an email is to use a different browser ie Google. Emails are still received as normal on Firefox / BT mail

Since the update I performed today, 4/27/26, I am unable to upload files to my NAS via the Firefox web browser on a Windows 11 PC. I can still do it via the Google Chrome browser so I am not completely crippled, but it would be nice if I could still use Firefox for this work. Any suggestions on how to fix this, or will it require the software itself to be fixed?

Hi everyone,

I’m facing a strange issue with Firefox and need some help.

When I try to use Firefox normally, it sometimes opens but doesn’t load pages properly or gets stuck on a blank screen. I’ve already checked my internet connection and it’s working fine in other browsers.

I also tried restarting Flixfox and clearing cache, but the issue still comes back randomly.

Has anyone experienced something similar or knows what could be causing this? Any guidance would be really appreciated.

The page pops up for a second first, then this happens. They worked yesterday. It happens the same in safe mode. opera works for those sites. Firefox hasn't changed. I log firefox's output, find no errors reported. I did upgrade a few packages yesterday: fontconfig, haveged, qt5, nodejs, which .

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.

After the recent Firefox update to 151.0 I can no longer log into Facebook. The reCAPTCHA is now broken. I did a system restore to version 150.0.3 and it works fine. Something is broken and I don't want to restore all my computers and devices. Thank You.

Hi, My bank tries to open a new page to display certain info (after I'm logged in and have seen the main account page). The new page won't display and the error message tells me I need to update my browser. I updated last week, and there's nothing newer - I just checked the Firefox page to make sure. Called the bank, they just repeat that I need to update browser. Any ideas? I admit my Macbook is quite old, could that be causing a problem? Thank you.

Sites are now crashing because Firefox has "run out of disk space"

My most full drive is only 72% full and there are multiple other drives I could switch to with terabytes of spare storage. I also have plenty of indexes free, these are only 2% used.

But how? The solution page only offers advice for clearing cookies and data. I don't want to do that.

I have tried increasing dom.storage.default_cache and dom.storage.(I can't remember the exact syntax, but it was the site specific default cache), and I then tried killing and restarting chrome, but the issue persists and it means I can't run WhatsApp in my browser anymore, currently the only Linux WhatsApp solution.

It also affects multiple sites which struggle to load the css correctly, or crash altogether (the firefox help page and deepl.com)

Hi, I’m testing a WordPress website in Firefox and noticed that some recent changes (like text or small layout updates) don’t appear immediately. The site is using Cloudflare CDN and caching, and even after refreshing or clearing cache, the older version sometimes still shows.

 [[Website | https://restaurantstocustomer.com/]]

Could this be related to Firefox caching behavior? Is there anything specific I should check to make sure updates appear correctly?

Thanks in advance for any help.