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I'm not sure why you'd do that. In the end, if a person is going to be downloading an extension, they're better off getting Tampermonkey and downloading the userscript. Something as trivial as what I've made shouldn't be an extension since there isn't really any substance to it.
BTW, in dev version of chrome, it's possible to install script as an extension anyway, without the tampermonkey.
Converted to chrome extension
I took the liberty to convert this to an extension for chrome and uploaded it to the chrome webstore @ goo.gl/JbNzDZ
I hope its okay with you! Great script btw.