Firefox port

[kav2k]

Firefox WebExtensions platform is getting mature.

In addition, with the switch to WebExtensions-only in FF 57 in a couple of months, there will be renewed interests in discovering such add-ons.

Current code works in Firefox perfectly with just one change (adding applications key to the manifest is required for storage.sync).

[kav2k]

This probably requires a build step and two separate manifests for Chrome and Firefox.

Here's an example of how I approach this: https://github.com/knyar/theoldreader-chrome/blob/master/Makefile

[napsternxg]

This is great, if it is that easy to port then I can package it once we change the API.

[MikkCZ]

Just a note, Firefox has built-in system add-on integrating Pocket, so the battle for users may be harder there.