I use tree style tabs[treeee] in Firefox and often open 5-10, process them (which may involve opening several more each). Eventually I find the information I need, but this makes it easy to group the depth of my search. This branch is from the API docs, that branch is from StackOverflow (and usually has a subbranch of questions that catch my attention from the more fun StackExchange sites, whoops), and then another branch with language specific questions. I try to clear everything at the end of the week, but it's really not a huge burden because I can collapse a tree and just mentally ignore it until then. Average day with lots of coding? 100+ tabs easily.

[treeee]: https://addons.mozilla.org/en-us/firefox/addon/tree-style-ta...