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UnMHT for Opera/Safari
A free Safari and.or Opera UserScript that will allow you to view MHT files on your Mac...
User Script
A Firefox add-on that allows a global userScript.js file...
Tampermonkey
A small Google Chrome extension that makes you browser compatible with GreaseMonkey...
userscript Greasemonkey userscript support GreaseMonkey compatibility GreaseMonkey add-on