Method 1: Temporary install (developer mode)

  1. Open Firefox and go to about:debugging in the address bar
  2. Click "This Firefox" in the sidebar
  3. Click "Load Temporary Add-on…"
  4. Select the manifest.json file inside the extension folder
  5. Done! (You'll need to reload it after restarting Firefox)

Method 2: Packaged install (permanent)

Package the extension as an .xpi file:

cd openimmersive
zip -r ../openimmersive.xpi . -x "*.DS_Store" -x "__MACOSX/*"
  1. In Firefox, go to about:config
  2. Search for xpinstall.signatures.required and set it to false
  3. Open about:addons, click the ⚙️ icon → "Install Add-on From File"
  4. Select openimmersive.xpi