alt Hacker Newsit's probably the "you only notice when it doesn't work" situation, but my experience with firefox on ram limit has been a lot about tabs forgetting the url in them
as in, I click "open in new tab", some time later I switch to them... only to get hit with "new tab", even though a moment ago it displayed tab name and I could right click -> bookmark to preemptively copy the address
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Haven't had that happen, but what I have had happen is that I open in a new tab, and it just displays this spinner in the middle of the window while on the tab. It never loads. I take the URL from the address bar and drag it into yet a newer tab and there it loads. Then I close the original new tab. Sometimes I gotta do that a few times for the thing to load. I tend to open in new tab with middle click, if it makes a difference.
Try the "Auto tab discard" extension. It allows me to have hundreds of tabs "open" and (in combination with Tree Style Tabs) largely blur the line between "browser sessions" and "bookmarks".