I help a lot of people in a given week, and my browser tabs are out of control. What has helped a lot for me is opening all of the tabs for a particular issue in a new window, and often putting them as the only thing on my smallest monitor is a decent compromise for not losing it. Once I minimize that window it gets lost quickly, which also contributes to the tabs problem. Still need to solve that issue.

To a lesser extent, the smart location bar for Firefox at least will tell you if you already have that url open elsewhere, which saves me from abandoned/divergent wiki edits and lost workflows. Not always, but routinely for sure. It also can search your bookmarks, so tagging things with the name you think they should have helps a lot there. Now if I could just get better at deleting malformed urls from my history...

Except for the single window piece, these aren't exactly 'mis-en-place'. They're more second-order effects, akin to putting the common ingredients on the "right" shelf, so you can grab them quicker. The invisible ingredient in 'mis-en-place' is your head. If that's a mess at the beginning of the task then everything will be off. So you can 'mis' all you want but if you run an obstacle course to get there it's going to help but not as much as it could. Like showing up to a race tired.