Useful. But it blocks me from opening a new Private Window when I actually want to.

command + Shift + P doesn't work anymore after installing this add-on.

It won't open a closed tab without me enabling the setting 'allow all new tabs'. Undo closed tab extension won't work with it.

Working so well so it blocks browser's new windows called by user itself.

I use a mac version of firefox if that matters. This add-on would get five stars, but it prevents you from opening new windows on your own. If I tell firefox to open a new window it just closes immediately. I have to temporarily disable it in order to open a second window.

* Error: Blocks all new windows, even when clicking "open link in new window" or opening a new window from the Firefox main menu! (if enabled global)
* Good to use by putting certain sites on the black-list.
* Minor: When a pop-up was blocked and I click "allow once" via the add-on symbol, it does not open the pop-up, but starts the "all pop-ups allowed for 20 seconds" countdown. If that is what the button does, why change its label to "allow once"?

Result: Simple add-on. Still helps. Will continue using.

* Idea: Implement per-host settings
* Suggestion: Option to block pop-ups / tabs from other hosts than the current

It is nice but I unintalled it because crashes when I make Firefox work with 4 processes.Please solve this

Could you add the option to block the popups instead of opening and closing them? Or could you make the closing be instant? The windows specially take a lot of time and the tabs make the screen blink. Which is annoying for sites that try to open a new tab almost every time you click.

Could you add the option to allow all popups except for pages on the blacklist and the blacklist to have the option to block tabs, windows or both?

EDIT: Thanks for your response. Would be nice to maybe create a github so people can leave you suggestions or bug reports there.