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I keep getting the message "This search engine isn't supported by Firefox and can't be installed" whenever I try to install ANY search plugin on the Mozilla Add-ons website. Why?

Posted

No matter which search plugin I choose to install from the list of FireFox search plugins on the Mozilla Add-ons website, I get the same error message - "This search engine isn't supported by FireFox and can't be installed". I tried deleting the 3 files in my profile identified in the article on troubleshooting plugins, but it didn't help. I am running Firefox with administrator privileges, but that doesn't help. The problem appears to be only with search plugins. I can install other extensions that are not search plugins from the Mozilla Add-ons site, but not search plugins. I tried restarting FireFox and rebooting the computer severaltimes, but I keep getting the same error message when I try to install a search plugin.

Chosen solution

Something is messed up on the AMO seacrh plugins pages. Try clearing the URL bar and type anything there (but don't hit Enter) - then you should be able to proceed with installing a search plugin.

Read this answer in context 11

Additional System Details

This happened

Every time Firefox opened

This started when...

I'm not sure when this started. It may always have been a problem because I haven't tried to install any search plugins before.

Installed Plug-ins

  • Default Plug-in
  • Shockwave Flash 10.2 r152
  • 4.0.50917.0
  • NPWLPG
  • Google Update
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
  • Adobe PDF Plug-In For Firefox and Netscape "9.3.4"

Application

  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13

More Information

I am running FireFox 3.6.13 on Windows 7 Home Premium. The computer is a Toshiba notebook with an Intel Core i5 processor and 4 GB of main memory.

the-edmeister
  • Top 10 Contributor
  • Moderator
3197 solutions 24406 answers

Chosen Solution

Something is messed up on the AMO seacrh plugins pages. Try clearing the URL bar and type anything there (but don't hit Enter) - then you should be able to proceed with installing a search plugin.

cor-el
  • Top 10 Contributor
  • Moderator
10762 solutions 96861 answers

Does it work on the Mycroft website?

Question owner

WOW!! That worked! Thank you so much for your help!  :-)

johnmblack 0 solutions 3 answers

If you are creating your own search plugins, be aware that you will get this same error if the path to the XML in your action script must be an absolute URL, even if the XML file is in the same location as the page that is pointing to it.

IOW, this will never work:

  • window.external.AddSearchProvider('MySearchDefinition.xml');

it must be:

Modified by johnmblack