To use this:

  1. Download the source (If downloading the zip, extract it to a folder).
  2. Go To "Add-ons" > "Extensions".
  3. Click on the gear icon towards the rop right side.
  4. Click on "Debug Add-ons".
  5. Click on "Load temporary Add-on".
  6. Open the file "mainfest.json" from the files you extracted.