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Some websites have microscopic text when viewed on a phone, because the site's designer just doesn't bother to support mobile users - an addon like this is an absolute necessity, if the browser itself doesn't allow you to set a minimum font size. Wish this were compatible with Firefox 39.

Это отзыв для предыдущей версии этого дополнения (4.3). 

It is compatible with the latest versions on desktop. It just hasn't been ported to Firefox mobile (nor will it be, unless someone donates $5000).