I agree that they could be a source of weak infrasound (<20 Hz), but apart of fringe web sites nobody was able to determine a significant effect on humans or animals.

Their pseudo science blames some kind of infrasound waves from the turbines.

I agree, also there is the risk of installing a malicious add-on, specially if it is not hosted by Mozilla.

I will check them out, thanks.

• Bypass Paywalls Clean
• Copy PlainText
• Easy Youtube Video Downloader Express
• Feedbro
• Flagfox
• FoxClocks
• Grammar Checker & Paraphraser – LanguageTool
• Library Extension
• OneTab
• Print Edit WE
• Resurrect Pages
• Search by Image
• The Camelizer
• uBlock Origin
• Unhook - Remove YouTube Recommended Videos
• Video DownloadHelper