Fix: Compatibility issues for Firefox

[GODrums]

Motivation

Fixes #243.

Description

With this PR we want to start supporting Firefox-based browsers for the new versions of the extension again. To achieve this, this PR changes:

• New popup exclusive to the Firefox version to provide an option of requesting the required Steam permissions as the BetterTracking-widget doesn't work in Firefox
• Adjust declarativeNetRequest-rules according to Firefox's random IDs
• Change minimum Firefox version to 127.0 to guarantee permissions listed in host_permissions are granted on install (source: https://extensionworkshop.com/documentation/develop/manifest-v3-migration-guide/)
• Chore: update @types/chrome to 0.0.300 to successfully use async/await on chrome.permissions-methods

Possible TODOs:

• Adjust the BetterTracking "Enable"-button for Firefox to refer to the popup (automatic opening not possible in Firefox)
• Further popup features:
  • Error state for popup in case of a permission deny
  • More detailed permission status
  • Explanatory text / links / CSFloat socials

Screenshots

Popup with missing permissions:

Popup with granted permissons:

[Step7750]

Thanks @GODrums, Firefox users shall rejoice!

[Step7750]

Almost forgot, I believe we may need to hide the enable offer tracking banner that Chrome gets (or replace it with something that tells them to open the extension popover in the top right).

AFAIK, we cannot programmatically open the extension popover (if we can, that'd be preferrable). I'll add custom instructions for FF users in the front-end.

[GODrums]

@Step7750
Those are very good points! I adjusted the button in the following way now:

• Change text to "Enable in the Extension Popup"
• Switch the button to Steam's grey button design + make it disabled:
  
• On click, the user gets a popup to use the extension popup instead:
  

Let me know what you think of these changes.

[Step7750]

LGTM