The Firefox memes are stupid and just go to show how far and fast disinformation can spread.
There was a viral tweet that showed the evolvement of the Firefox logo over the years, with the last logo being that of the parent brand (which was created 2 years ago), which is just a circular gust of flame. The caption read something along the lines of “Firefox killed the fox from their logo!”. The tweet went viral because zero people fact check anything people tweet, and Firefox finally responded saying that the fox logo is still being used as the browser.
Come over to Reddit and you have a whole bunch of meme makers who believed the Firefox logo was just changed (when no logo changes have been made for years), because they take the word of a random tweet.