# Add Custom Build to Firefox

* Create a local build of MetaMask using your preferred method.
  * You can find build instructions in the [readme](https://github.com/MetaMask/metamask-extension#readme).
* Go to the url `about:debugging#addons`.
* Click the button `Load Temporary Add-On`.
* Select the file `metamask-extension/dist/firefox/manifest.json`.
* You can optionally enable debugging, and click `Debug`, for a console window that logs all of Metamask's processes to a single console.

If you have problems debugging, try connecting to the IRC channel `#webextensions` on `irc.mozilla.org`.
For longer questions, use the StackOverflow tag `firefox-addons`.
