Extending github-highlight-selected chrome extension to every webpage
<p>I found a chrome extension called github-highlight-selected at <a href="https://github.com/Nuclides/github-highlight-selected" rel="nofollow">https://github.com/Nuclides/github-highlight-selected</a> 
I am trying to extend this function to every webpages not just Github.
I thought it would be simply changing the manifest.json for
    <code>"matches": [ "https://github.com/*" ]</code> 
to 
    <code>"matches": ["&lt;all_urls&gt;"]</code>
However, the extension does not work outside of Github. Nothing is highlighted when text is selected.
Can anyone guide me in the right direction?
Thanks!</p>