Impossible to add new search addons - error says I'm not under Firefox

I'm running Firefox 39.0 and tries to install the [WorldCat search plugin] (https://addons.mozilla.org/en-US/firefox/addon/worldcat/?src=search). I can't - I get an error.

   Sorry, you need a Mozilla-based browser (such as Firefox) to install a search plugin.

It looks like a another user had the same error: https://support.mozilla.org/en-US/questions/1062916 but their solution will not work in this case.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem.

  • Put yourself in the DEFAULT theme: Firefox/tools > Modules > appearance
  • Do NOT click on the reset button on the startup window Mode safe

Tags: Firefox

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