Font Inspector (WebExtension) – Get this Extension for 🦊 Firefox

Download Font Inspector (WebExtension) for Firefox. Click on any element to get the font info in a page popup

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Copy Link Extras – Get this Extension for 🦊 Firefox (en-US)

Firefox Add-ons For Application Security Testing

Copy PlainText – Get this Extension for 🦊 Firefox (en-US)

Persistent Highlighter – Get this Extension for 🦊 Firefox (en-US)

Extension Inspector – Get this Extension for 🦊 Firefox (en-US)

Treetop – Get this Extension for 🦊 Firefox (en-US)

5 Best Mozilla Firefox Addons in 2023 [#2 is A Must-Have]

WebExtensions in Firefox 48 Mozilla Add-ons Community Blog

Formlet – Get this Extension for 🦊 Firefox (en-US)

Tab Auto Refresh – Get this Extension for 🦊 Firefox (en-US)

Treetop – Get this Extension for 🦊 Firefox (en-US)