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What extensions and plug iins can I trust the blocked list contains some pretty familiar products

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does firefox have an approved list of extensions and plug ins that i can fully trust to not harm my computer.I have downloaded items from the addons web page only to just read in the blocked list that they are malware. including a popular your tube to mp3 addon.

does firefox have an approved list of extensions and plug ins that i can fully trust to not harm my computer.I have downloaded items from the addons web page only to just read in the blocked list that they are malware. including a popular your tube to mp3 addon.

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The blocklist isn't limited to malware. It also contains old versions of legitimate software that contain security vulnerabilities or cause stability or performance problems.
Malware add-ons are often named based on popular sites or brands, e.g. Youtube Facebook Player. Just because the name looks familiar doesn't mean it's legitimate.

Add-ons hosted on the Firefox Add-ons site that have been reviewed will not harm your computer. These add-ons are marked by a green “Add to Firefox” button.
Add-ons hosted on the Firefox Add-ons site that have been preliminarily reviewed will not harm your computer either, but they may have some irritating flaws.
Add-ons hosted on the Firefox Add-ons site that have many poor reviews may not work correctly, or at all.
Add-ons hosted on third-party sites should only be installed if you're positive the site in question is trustworthy.
Add-ons bundled with other software should only be installed if you're positive that software is trustworthy.