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>right now opera:cpu shows me a round number of 115 tabs with 1.5 GB RAM usage

That's impressive, but I can't imagine having over 5 tabs open. It would be impossible for me to use that many at once.

I use tabs instead of bookmarks. Opera also has tab groups, so I can drag one tab to another to create a collapsible group of tabs related to a particular project. It's not unusual for me to have a handful of tab groups with a dozen of tabs in each, plus half a dozen of regular tabs for what I'm currently reading. The only down side with this is that browsing is slower when I just have started my browser and I'm waiting for all the tabs to load, but I don't close my browser that often. [Edit: apparently there are startup speed improvements in Opera 12 specifically for the many-tabs-open use case]

I also use the tab stacking feature, so many related tabs are grouped together. Right now I have 2 full column of tabs and groups on the left side of my screen. It's actually very comfortable, although sometimes I clean up a lot of them. Like another user said here, I use them as bookmarks, or in my case as "read-later" lists, so I never completely forget about something I want to do or read.

I think it's a matter of habit. You can't use so many tabs if you don't have (at least) a multiline tab bar, preferably one aligned vertically.

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