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can't instal add-on

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I'm trying to install ixquick or StartPage from the Firefox add-ons page but I get the following:

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

even though I'm using Firefox 38.0 on Ubuntu 14.04 LTS

Any assistance would be very much appreciated.

I'm trying to install ixquick or StartPage from the Firefox add-ons page but I get the following: "Sorry, you need a Mozilla-based browser (such as Firefox) to install a search plugin. OK" even though I'm using Firefox 38.0 on Ubuntu 14.04 LTS Any assistance would be very much appreciated.

Chosen solution

That's strange since your Firefox does not appear to be cloaking its identity on this site.

Those search sites both have an "Add to Firefox" link below the search box on their home pages:

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Suluhisho teule

That's strange since your Firefox does not appear to be cloaking its identity on this site.

Those search sites both have an "Add to Firefox" link below the search box on their home pages: