Option 1: addons.mozilla.org (AMO)
https://addons.mozilla.org/firefox/addon/VimFx
Follow the above link and hit the green “Install” button and you should be ready to go!
- Signed and reviewed by Mozilla.
- Hosted on AMO.
- Automatic updates.
Option 2: GitHub releases
Go to VimFx’s releases page and click the link to “VimFx.xpi” for the version you’re interested in (most likely the latest). Firefox should then ask you about allowing the installation. (If not, download the .xpi file and open it in Firefox.)
- Signed by Mozilla (but not reviewed).
- Available as a backup alternative, and in case of slow reviews on AMO.
- No automatic updates.
Build VimFx and then open the produced build/VimFx.xpi
file.
- Unsigned.
- Bleeding edge.
- Allows you to fiddle with the code.
- No automatic updates.
Firefox add-ons are .xpi files (a renamed .zip file—try renaming it to .zip and open it like any old .zip file to see what’s inside). There are several ways of installing them:
- Drag and drop the .xpi file into the Firefox window.
- Press ctrl+o and choose the .xpi file.
- Use “Install from file…” in the top-right menu in the Add-ons Manager.
By default it is not possible to install add-ons which haven’t been signed by Mozilla. In order for an add-on to be signed it must pass some code checks. The idea is to protect users from malware.
If you’re interested in installing an unsigned add-on (such as if you’ve built a VimFx .xpi from source yourself), read all about extension signing here: