Hide Comments Everywhere - Firefox Add-on
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Add-on summary
Hide various commenting systems across the web, including (but not limited to) Disqus, YouTube, various news sites and forums, etc.
USAGE
This addon checks whether it should allow or block comments for a website, based on a combination of sites I've added to a list, as well as a personal whitelist (always allow comments) and blacklist (always block comments) that you can define on the Options page.
Your personal lists use synchronized storage, so they should be available on any machine you've installed the extension on and have logged into the same account with.
Click on the icon in the toolbar and press the large "toggle" button to temporarily toggle enabling/disabling the extension for a single tab.
PERMISSIONS
You'll be notified that it can "read and change all your data on the websites you visit" because that's how it works - it hides certain comment-related elements on the page so you don't see them.
It also uses storage to save its state, but it probably won't prompt you for that.
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Add-on safety
Risk impact
Hide Comments Everywhere requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk likelihood
Hide Comments Everywhere has earned a fairly good reputation and likely can be trusted.