rss feed reader for firefox

I have tried the sage firefox extention and when I can get it installed it seems to work well. I was able to install it on a win98 system but when I tried to install it on winxp (firefox .92) it would not install. I found that I had turned off the install software feature in the options menu. When I turned this option on, sage installed without a problem.

I have not yet tried to install it on my linux system.