yet another greasemonkey
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Chrome
This is the old version of NinjaKit still, if using Google Chrome you should use TamperMonkey instead! https://chrome.google.com/webstore/detail/gpbepnljaakggeobkclonlkhbdgccfek
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Safari
https://github.com/techietrash/NinjaKit/raw/ui++/NinjaKit.safariextz
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Opera
coming soon...
The extension is built and installed from within Safari itself, using the Develop menu and the Extension Builder. For more information, see Apple's guide on the subject.