Just wrote this userscript for myself but I figure that others might find it useful:
pastebin.com/KmyHKJRn (hides tweets based on hashtag)
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You probably need some JS and Greasemonkey knowledge to use this, but you can easily adapt it to filter for tweet content etc
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I also have a stylesheet to hide ads and annoying UI elements, the script is designed to work with it: pastebin.com/JfgaCSH4
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you *can* do that but it's a ton of boilerplate and google want me to give them five bucks to upload signed extensions
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