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Why can't I add an add-on?

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I just downloaded Firefox for android and I tried installing an add on. But the installation just kept failing. I tried many times to install the add on but it I just couldn't install it. Please help.

I just downloaded Firefox for android and I tried installing an add on. But the installation just kept failing. I tried many times to install the add on but it I just couldn't install it. Please help.

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Which add-on?

By default add-ons that work on desktop Firefox do not work with Firefox for Android. The add-on author needs to create a compatible add-on for Firefox for Android.