Firefox DNS Cache

[witek]

Hello,

I noticed that FF sometimes has problems with cached addresses and can`t find some websites. There is an extension called "DNS Flusher" that solves the problem but it won`t show in the FF toolbar in Sparky, even though it seems to be installed. It works well in Ubuntu-derived distributions however. I tested both FF ESR and the latest. Any idea how to make it work or maybe how to clear DNS cache manually?