As I was getting Firefox setup on my newly setup Mint system, I needed to make a couple about:config tweaks to make the process a little easier. Enable the ‘Install Button’ (Firefox 3.6 and older) In a new tab, type about:config in the address bar and press enter (If needed) click the I’ll Be Careful button In the filter field enter extensions.hideInstallButton In the preference list double-click on extensions.hideInstallButton to change the value to False Note: Firefox 4 and newer the install button is available, albeit hidden in the ‘Gear’ Menu in the add-ons manager select Install Add-on From File…:…