Port for Firefox

[imadeanaccount1]

This is a new PR bc this one is based from my own fork. (First version: #32, 2nd version: #68)

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Restored Tasks: [8/3/2023] - Here are my current tasks to make this work:

• [x] Show initial extension message badge
• [x] Update extension badge when new messages received
• [x] Play Sound Effect when new messages received
• [x] Show Notifications when new messages received

[8/7/2023] - New tasks!

• [x] Fix route change problems
• [ ] Test in Chrome (Well, we don't want a version that works in Firefox but not in Chrome, do we!)