Very minimalist and precise.
Suggestion: I could give you a prompt to tell that the tab is being closed by the add on, just to make sure that is not a bug on my browser.

Works perfect for me because of its precision

اكثر من رائع شكرا جدا جدا

Does the job. Thank you!
Suggestions:
1. Allow resizing the tiny input dialog (just 3 lines tall atm).
2. Allow sorting the entries.
3. Tell us more about the syntax used. It looks like RegEx. Is it?
4. Does whitelist take precedence over blacklist (the opposite is usually true)?
5. Offer option to either close the blacklisted tab or redirect to 127.0.0.0
6. Next level: Enable right-clicking on a tab to open a dialog to add the domain.

I have checked many extension available but this is the best one with simple whitelist and black list solution. But for proper usage this extension need improvements.
1. Need password to restrict other users (except admin) changing the settings.
2. Updates to the whitelist and blacklist done via the toolbar-icon should be removed from there and changed to option setting page with password to avoid option changing.
3. My aim of using whitelist and blacklist via Firefox was to help my kids use internet effectively and this is the only simple solution i have found. But need modification otherwise my kids can easily change settings.
4. Add timer to restrict access so this will be a complete a parental tool.
If you can make these changes I can give you thousands and thousands of users. Thank you.

Just want to thank you for this. Does exactly what I was looking for. I want to improve my productivity on the internet and this does it for me.
For example, I block 'youtube.com', but I allow 'youtube.com/feed/subscriptions' and 'youtube.com/watch/*', this means that the only pages available to me are the subscriptions page and the videos that I subsequently click on from that page. No more distractions.
(ofc I can still view random videos if I click on youtube links from outside youtube, but this addon stops me loading up youtube to see what's new and then getting sucked into watching things that I'm not even subscribed to).

Exactly the level of precision I needed. Thank you so much.

Works perfect!

This is the best website blocker. totally suits my case where I wanted to allow only specific set of websites to use. Loved it's simplicity

This is the only extension I've found that allows both a whitelist and a blacklist to run at the same time. Really helpful. I just wish it was open source so I could help with some of the TODOs.