Hi
i have downloaded firefox extensions that web designers use them like fireftp-1.0.6-fx.xpi , html_validator-0.8.5.8-fx+mz+sm-win.xpi and css_validator-3.0.0-fx.xpi but I couldn’t install them , it has showed this error that it couldn’t install because of it is not compatible with this version of fire fox . I have installed different versions of firefox like 3.5.2 , 3..5.4 , 3.5.6 .
how can I install them ?
thanks