Firefox Addons

Firevim (broken)

• GitHub
• Currently broken in thunderbird (again...) #1263
• Troubleshooting
• Try with http://txti.es/

Addon / extension development

• Add-on signing in Firefox

What are my options if I want to use an unsigned add-on? (advanced users) Firefox Extended Support Release (ESR), Firefox Developer Edition and Nightly versions of Firefox will allow you to override the setting to enforce the extension signing requirement, by changing the preference xpinstall.signatures.required to false in the Firefox Configuration Editor (about:config page). … There are also special unbranded versions of Firefox that allow this override.

Tampermonkey

• addon store
• Website
• Docs