If the internet browsing with firefox is slow, check this guide to speed up Firefox browsing and loading time.
1) Open FireFox and type "about:config" into the address bar and hit return. Scroll down and look for the following entries:
network.http.pipelining, network.http.proxy.pipelining & network.http.pipelining.maxrequests
Normally the browser will make one request to a web page at a time. When you enable pipelining it will make several at once, which really speeds up page loading.
Change your shortcut to this:
"Drive:Install PathMozilla Firefoxfirefox.exe" /prefetch:1
(where Drive is your HDD, eg C: and Install Path the installation folder from Firefox. If you install it with default values, the correct sortcut should be
"C:Program FilesMozilla Firefoxfirefox.exe" /prefetch:1