Firefox Compatibility

[SkylerBurger]

As a user, I would like the option to install the Mynt Dialer extension on Firefox browsers.

• [ ] Research creation/packaging of Firefox extensions
• [ ] Create separate build commands that package the Chrome and Firefox extensions for installation
• [ ] Install and test locally in Firefox
• [ ] Update installation instructions in the README

[SkylerBurger]

Research shows that the extension as it is written for Chrome is sufficient. Packaging of an installable version will be the real trick.

• The contents of the build folder, not the folder itself, need to be compressed. If the manifest.json is not at the top level of the .zip file it will be considered corrupt.
• I'll need my own Mozilla AMO account in order to "self-sign" my extension so it can be self-hosted for download and installed on the browser. Without a signature the extension can only be installed temporarily and is uninstalled when the browser window closes.
• This packaging process will need to be worked into the future GitHub Action that will package the extension for Chrome and FireFox upon merge to main.