Re-enable the webcompat bundled extension

💡 Proposal

Spinning off #44082

Originally, the webcompat extension was dropped in #21431 (closed).

However, there aren't many information about a deep audit. We might do one.

User Story

Mozilla provides a series of scripts to improve compatibility with known broken websites.

It'd be nice if Tor/Mullvad Browser users could also benefit from them.

Security and Privacy Implications

Security

Scripts that are potentially downloaded through remote settings (not sure about this, though).

We might want to be sure to ship only scripts with the browser, to avoid targeting.

Privacy

We need to audit this feature, and make sure it doesn't call home.

Also, if the reporter is part of this extension, we'll have to disable it, as users might think they're sending the report to us.

Accessibility Implications

Might be good for a11y, in case some webcompat interventions are about a11y?

Other Trade-Offs

Needs audit.

Prior Art

Does this feature exist in other browsers?

• Yes
  • Firefox
  • Firefox ESR
  • Other (please specify)
• No

Does this feature exist as an extension? If yes, which one provides this functionality?

It's a bundled extension we currently disable in BB 21431: Clean-up system extensions shipped in Firefox.

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