uwRMP firefox mv2 release

Initial mv2 firefox extension release with basic RMP functionality

Available for install from Mozilla extension store here.

To start using right away:

1. Download zip file
2. Extract zip file
3. Navigate to about:debugging#/runtime/this-firefox on Firefox browser
4. Click Load Temporary Add-On
5. Click into the extracted file, select manifest.json
6. Verify that the extension has loaded and is enabled (it should pop up right away under Temporary Extensions)

Once the extension is visible in the list, you are good to go. Can test with this link.

NOTE: Firefox does not allow you to add unsigned extensions permanently, so this process will have to be repeated every time that Firefox is restarted.