Having covered installing extensions for Chrome manfully let us take a look how to install add-ons in Firefox 4 manfully from File,sometimes you need to install add-ons for Firefox from other websites apart from Mozilla add-ons galley so you can’t trust and install those add-ons directly from other websites instead you can download that add-on,scan with antivirus if you need and then install it manually in Firefox 4.

Installing Add-ons in Firefox 4 manually

  • Right click on that add-on and click “Save  Link As”  to save to your Computer.

saving Firefox 4 add-ons

  • Now open Firefox 4 add-ons manager from Firefox button >Add-ons
  • Click Tools for add-ons, click “Install Add-on from File” select add-on saved to your Computer and click Open.

install add-on from File in Firefox 4

  • Add-on will be installed in Firefox 4.

Note:You can also install add-on manually by pressing Ctrl+o and selecting saved add-on from your Computer.