Extension Guardian by Laboski

Add-ons can see a lot: your email, your bank, everything you type. Most are honest. But add-ons get sold, and new owners sometimes turn a trusted tool into adware or spyware. Firefox installs the update, and nothing tells you that someone else is now behind it.

Extension Guardian watches your add-ons so you don't have to.

WHAT IT CHECKS
• New owner: warns you when the authors listed on Firefox Add-ons change, the most common sign of a sale.
• New permissions: tells you when an update asks for more access, like reading every website.
• Removed from Firefox Add-ons: Mozilla takes down malicious add-ons. If one you have disappears, you'll know.
• Installed behind your back: flags add-ons that another program added, and ones that aren't listed on Firefox Add-ons at all.

TWO CLEAR RATINGS
• Access: what each add-on can do (full, limited or basic), in plain language.
• Risk: whether to trust it, from real signals: who makes it, how many people use it, whether it's maintained, and the warnings above.

A password manager needs full access to work, so full access alone doesn't mean danger. Extension Guardian tells the two apart, so you only get alerts that matter.

PRIVATE BY DESIGN
• Your list of add-ons and all results stay on your device.
• Developer checks go straight to the public Firefox Add-ons API. Nothing is sent to us.
• No ads, no analytics, no tracking.
• Open source (MIT): https://github.com/laboskiriste/extension-guardian

Firefox doesn't let one add-on turn off or remove another, so you do that yourself in about:addons.