Tell me if this happens to you in Firefox: When you click on a link taking you to a new site, more often than not, the PR bar will not show the landing page's true PR. 9 times out of 10 (for me, at least) you have to refresh the page to get the true PR. Is this normal behavior in your Firefox browser, also?
That does not happen to me. Only in some cases the PR bar will still show the PR from the last page I visited. Maybe it's the addon you're using to show the PR bar that is not working right, I doubt it is Firefox causing the problem.
Ignore visible PR, Google has real-time PR that probably doesn't match it. Just focus on quality and growth.
Yes, google toolbar abit slow on loading the PR, the PR you see is the previous site PR. Suggest to install - searchstatus which is much better
When I use a slow connection sometimes I can C things I cannot on a fast one, and sometimes things time out, like refreshes, so things like this happen, best to keep your focus and not get distracted by ghosts in the machines.
I guess it might be a problem with your internet service provider and not the firefox or the google toolbar ... lol !!!!! When you open a site, it might be taking lot of time to open the homepage of the site, thatz why the PR which is displayed in the google toolbar is of the previous page or site, you viewed.
I think it more related to connectivity issues between your browser and google servers serving PR. I'm sure if you will wait a bit it will show PR. I have similar symptoms sometimes.