DivX for Mac
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Full user review
"Makes watching videos impossible"
There are none.
Not only doesn't it play video, it makes the screen go black with a blank white box in the middle so you can't do anything else, either. You have to cmd-Q out of your web browser and start over. Most irritating browser plugin ever.
Avoid. Avoid. Avoid. If you get a pop-up asking you to upgrade to the latest version it's already too late - that popup window won't ever close (whether you upgrade or not). Seriously pathetic software.