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for Google Chrome use "Styler" url:https://chrome.google.com/webstore/detail/styler/bogdgcfoocbajfkjjolkmcdcnnellpkb
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for Mozilla FF use "Greasemonkey" url:https://addons.mozilla.org/ru/firefox/addon/greasemonkey/
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for Opera use "Scripter" url:https://addons.opera.com/ru/extensions/details/scripter-script-includer/?display=en
for the rest look for yourself :D