^^^^^^^ I think it's becausee of the technique that userglow uses. It's not compatible with Firefox...
Firefox has some major probs... I am using it for the last 2 years... and as I am into Open Source... so let me tell you... these problems are taking into account... and hope to get some new and better version very soon... it has some bugs too... I am telling you some tricks to speed up the browser... do the following... 1.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. 2. Alter the entries as follows: Set "network.http.pipelining" to "true" Set "network.http.proxy.pipelining" to "true" Set "network.http.pipelining.maxrequests" to some number like 30. This means it will make 30 requests at once. 3. Lastly right-click anywhere and select New-> Integer. Name it "nglayout.initialpaint.delay" and set its value to "0". This value is the amount of time the browser waits before it acts on information it receives.
yeah even for me firefox is just the best! but depends some systems may have probs we never know what might be messing with ff..