Option to allow extensions to run only on specific websites.

[alamalo]

There should be a way to allow extensions to execute only on specific websites like the Site access option in Edge does, this improves extensions usability and may also enhance privacy.

 

[WillSmith]

This thread started in 2022; it's 2025 now...

We keep hearing about how this extremely obvious, necessary and seemingly extremely easy to implement idea for a feature has garnered attention, yet here we are at 0% progress.

Honestly, what is Firefox even developing if not specifically this??
I can't think of a single thing that could me more important than fixing this glaring security issue which would also double as a massive sortof QoL feature...

Firefox is still the best browser, but this is irritating; just do the thing already...

[atonofclay]

Agree, this should be added to Firefox!!

[Boboss]

I’m surprised this feature is still missing. Firefox usually leads the way in privacy and customization. There should be an allow list and a block list, letting users specify domains or URLs.

That said, it’s probably not as simple as it sounds. Properly implementing this while preventing extensions from misusing cross-page access could be tricky. Some possible challenges include:

- Preventing Cross-Site Data Leakage (e.g., iframe access between allowed and blocked pages)
- Handling Redirects and Dynamic URLs
- Ensuring Extensions Can't Bypass Restrictions (e.g., injecting scripts indirectly)

Still, I hope Mozilla prioritizes this, as it would be a major improvement for user control and security!