Works well so far. I think the number detection could be made better but a good start.

My only real gripe is to do with integration in Google Contacts. When browsing my contacts there Google "helpfully" encloses any phone numbers in a link to Google Hangouts. If I hover over such a number I see a pop up for this plugin but as soon as I move my mouse to try and click the popup, it disappears.

In an ideal world this popup would work and not disappear. In an even more ideal world the Google Hangouts URL would be completely replaced with the relevant URL handler. In a world so ideal it hurts, right clicking on the link would also present the option (as would right clicking on any selected text that vaguely resembles a number, even if it doesn't match the length rules etc).

(ex Telify user here too)