Hi, I’m the developer of Vertical Tabs. Just in case you haven’t try it yet: Vertical Tabs can organize your tabs into groups and hide/show these groups on demand. You may install it from here if you like.
I’m working on the feature of bookmarking tab groups right now. 
Before I made this plugin, I was doing this from time to time, which sometimes becomes a time wasting process for me. I have to go through tons of tabs and decide if I still need it for each one of them.
Now with Vertical Tabs, you are able to group your tabs based on the contexts, like areas or projects. After finished a task, you may simply close a group. You may focus on the group you are working on with the Zen Mode. No more brain power wasting!