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Firefox suddenly stopped loading Pinterest, claiming there was a 'content encoding error'. Earlier today, I swear it reverted itself to an older version 3.6.10


I have an old version of Linux, but this hadn't been too much of a problem since I spent hours getting the latest version of Firefox that my system can run.

This morning, Firefox acted like it was automatically installing a newer version; BUT, when I opened it up, all the new features I had come to love & depend on were gone, and it suddenly had a lot of trouble with sites it never had before. I managed to tolerate this, because it wasn't worth spending literally all day or longer trying to find a newer version that *might* be supported by my OS.

After successfully using Pinterest not seconds before, I suddenly got a new error message ['Content encoding error: The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.'] and am completely blocked out of the site, unless you can do something about this!

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.2 r202
  • The Totem 2.28.2 plugin handles video and audio streams.
  • DivX Web Player version
  • 1.0.30401.0
  • The IcedTea NPR Web Browser Plugin (using IcedTea6 1.8.1 (6b18-1.8.1-0ubuntu1~9.10.1)) executes Java applets.


  • User Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100915 Ubuntu/9.10 (karmic) Firefox/3.6.10

More Information

I'm not sure of my previous version of Firefox, but it has now reverted itself to 3.6.10. Whatever version it was had an update button in the about-firefox window, and a handy spread of frequently-used websites on blank tabs. It took me many long hours to find and install whatever version that was.
I know it's ridiculous, but I'm running Ubuntu 9.10.

Question owner

Apparently clearing the cache solved the Pinterest problem immediately.

However, I'm still not content with this old version of Firefox, and it unsettles me that it reverted to this on its own. Many websites keep telling me this browser is too old, and it's much clunkier than the version I had become accustomed to. I'd very much like to know what's going on and get some leads on what to do to fix this.

Modified by resmc

Tyler Downer
  • Administrator
  • Moderator
1165 solutions 6641 answers

It's possible your User Agent got corrupted, read Websites say that Firefox is outdated or incompatible even though it's the latest version

Then update Firefox Update Firefox to the latest version

  • Top 10 Contributor
  • Moderator
10761 solutions 96858 answers

Make sure that you meet the system requirements for current Firefox versions.

You can find the latest Firefox release in all languages and for all Operating Systems here:

You may have a Firefox version from the software repositories of your Linux Firefox distribution.