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Firefox 18.0.2 introduced MAJOR CSS bug.

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After updating Firefox, the browser is for some odd reason no longer loading stylesheets properly. I am a web developer and have been using Firefox as my main development browser for the past 4 months or so (used to use Chrome). As of the update, none of my pages are working properly anymore, INCLUDING a site that has been online and unchanged since before the update. I thought the issue was with my own code until I found that the online (unchanged) version was also experiencing the same issues.

In looking at FireBug (in the Net panel), I found that ALL requests for CSS files result in a status of "Aborted". This includes a stylesheet loading from my own server, as well as stylesheets loading from LeafletJS and YouTube CDNs. I highly doubt all of these servers would all of a sudden become problematic, and as such I'm more or less 100% sure that the Firefox 18.0.2 update introduced a major bug that breaks websites.

I have a screenshot of my FireBug net panel, and will try to add it to this post after I post it.

After updating Firefox, the browser is for some odd reason no longer loading stylesheets properly. I am a web developer and have been using Firefox as my main development browser for the past 4 months or so (used to use Chrome). As of the update, none of my pages are working properly anymore, INCLUDING a site that has been online and unchanged since before the update. I thought the issue was with my own code until I found that the online (unchanged) version was also experiencing the same issues. In looking at FireBug (in the Net panel), I found that ALL requests for CSS files result in a status of "Aborted". This includes a stylesheet loading from my own server, as well as stylesheets loading from LeafletJS and YouTube CDNs. I highly doubt all of these servers would all of a sudden become problematic, and as such I'm more or less 100% sure that the Firefox 18.0.2 update introduced a major bug that breaks websites. I have a screenshot of my FireBug net panel, and will try to add it to this post after I post it.

All Replies (4)

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Here is an image of the screenshot I mentioned above. I also realize that there is probably a better avenue for submitting bug reports. I will try to find it now.

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Did you try to disable Firebug and use the build-in Firefox Web Console (Web Developer > Web Console;Ctrl+Shift+K)?

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
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Wow - incredible. The issue is with FireBug, not Firefox. THANKS for clearing that up. Time to go to bugzilla and update my report there...

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You're welcome.