Firefox software installation

[lozza]

I'm trying to install a new theme and some extesions to firefox on my desktop PC but everytine i click the install now icon i get the message:

Software installation is currently disabled. Click edit options.... to enable it and try again.

when i click edit option, normally on my laptop i get the allowed sites window with the name of the site i'm currently at and all i do is click allow and then alls fine. However on my desktop clicking edit options only opens the options window where i have to navigate to content and then to block popup windows allowed sites. i put the address of the site in and try again but it still comes up with the software installation is currently disabled message.

I've check all the setting and they are the same as on the laptop so now i'm

Can anyone help me please?

 

[lozza]

For anyone else interested in the solution, kindly provided bay someone on another forum:

Firefox 1.5: The option to enable software installation no longer exists in the user interface, so you will need to use about:config to reset the "xpinstall.enabled" preference to the default "true" value (bug 310737). These step-by-step instructions should fix the problem:

1. Type about:config in the Location Bar and hit enter.
2. Type xpi in the Filter box and find xpinstall.enabled in the list.
3. Make sure its value is set to "true" (double-click will toggle).