Firefox question

Does anyone else experience the following: every now and then when clicking a website, nothing will happen, with "Done" in the lower left corner appearing. And upon refreshing, the site will open? Or sometimes the "Done" thing will persist for a min or so and then you could finally open the website?

Also, sometimes Firefox won't display all the ads and pics on a page properly, but after a min or so, when refreshing, it will be back to normal again..

Like right now, as I'm typing this topic - above this square where you type text I see a bunch of words like "Align", "Ordered", "Unordrered", etcetc. and on the right I only see words instead of smileys. What the hell?

Oh and btw, I'm using Firefox 3.0.7