force certain url(s) to open with safari

I use firefox for my browsing, but I have so many blockers and security extensions in place that a few sites won't function in FF. so I just open those few sites with safari, and all is well. but I would like to force my these sites to open in safari, and all others open with ff. for example: when I drag a shortcut to my desktop from one of these sites, and force it to open with safari, it works that one time. but when I double-click on it again, it opens in ff (since ff is set globally as my default browser). help!