I just ran twice into a serious issue:
I was browsing with several tabs (4, then 10) and I noticed the current tab was marked as loading in the tab selector even if it was fully loaded.
I switched to another tab then returned to the buggy one and it was displaying the other tab's content instead. I tried to close the buggy tab: it didn't work. Then I double-clicked it to switch to it fullscreen. It would still display the content of the other tab and worse: The button on the bottom-right corner didn't appear so my only choice was to close the browser.