Add webcompat reporter to context menu in Firefox

[adamopenweb]

As someone who looks into the errors on page, I often right-click and go to my Inspector/Dev Tools. The context menu would be a great spot to put a link to the webcompat form.

[miketaylr]

Yeah, this shouldn't be very hard -- we should do it for all add-ons (not just Firefox dekstop) if they provide the APIs.

[miketaylr]

Chrome, Opera, Firefox: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/contextMenus https://developer.chrome.com/extensions/contextMenus

For Safari... https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/AddingContextualMenuItems/AddingContextualMenuItems.html

But I don't know if I want to keep maintaining it -- it costs $100 a year to be a developer and publish add-now. >:|

[akhilpandey95]

I'm on it @miketaylr

[miketaylr]

Awesome @AkhilHector!

[miketaylr]

(updating title to be just for Firefox, will file issue for Chrome and Opera)