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Firefox deleted Addblock plus and won't install it again

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So this week I realised that Firefox had deleted my addblock plus for some reason and I tried to install it again, but I'm stuck in the "downloading" part. I get no error messages, it just won't do it.

So this week I realised that Firefox had deleted my addblock plus for some reason and I tried to install it again, but I'm stuck in the "downloading" part. I get no error messages, it just won't do it.
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Unfortunately I'm not able to help you but since you seem to be comfortable with English and use Firefox in English, more people will see your question if you post it on the English version of this support site, which is https://support.mozilla.org/en-US/.