Same problem here, Intrepid 8.10 x64, Firefox 3.0.4. Seems to be random, but the problem is worse with 8.10 than it was with 8.04 x64 with 3.0b5.
Something I also noticed was that the contents of a tab stays the same after having clicked a link and it seems to have loaded the new data (so it doesn't seem to display the new data).
Same problem here, Intrepid 8.10 x64, Firefox 3.0.4. Seems to be random, but the problem is worse with 8.10 than it was with 8.04 x64 with 3.0b5.
Something I also noticed was that the contents of a tab stays the same after having clicked a link and it seems to have loaded the new data (so it doesn't seem to display the new data).