[Feature]: Firefox compatibility

[bam1279]

Prerequisites

• [X] I have verified that this issue is not a duplicate. (Search here to find out.)

Is your feature request related to a problem? Please describe.

Currently, the ShareSwitch extension is not available for Firefox users, which limits the usefulness of the extension for those who prefer or exclusively use this browser.

Describe the solution you'd like

I intend to make this extension compatible with Firefox.

Describe alternatives you've considered

No response

Additional context

No response

Do you want to implement this feature yourself?

• [X] Yes, I will implement this by myself and send a pull request

[bam1279]

ToDo

• [ ] Perform operational verification in Firefox
• [ ] If there are any problems, fix them
• [ ] Register with the Mozilla Developer Hub, sign, and undergo review
• [ ] Submit to addons.mozilla.org