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

Download ReFont for Firefox. Change the font on any website to one installed on your computer or hosted on the web.

I can't install any add-ons from the store, Firefox Support Forum

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

Find & Replace for Text Editing – Get this Extension for 🦊 Firefox (en-US)

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

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

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

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

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

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

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