Tabs Outliner is a super-smart Chrome extension that combines multi-tabs arrangement with grouping and adding comments and notes for further inspection and research.
The browser enhancer configured the tree structure arrangement in real-time, as you open new windows/tabs. If these new pages/addresses are not fully loaded, it reads the data and displays, in the tree structure, the page loading process. The visual indicator for this action is a loading circle.
Another super-useful option is the ability to drag certain tabs (or even the full window) and reposition them under a different window. Why would you need this? Because you can arrange in one set, based on certain criteria, similar online resources, and save them for later use. It's like making a to-do reading/researching list, but without the hassle of copying and pasting each page's URL.
Generally, when Chrome crashes due to diverse reasons (poor system performance, power cut, or buggish behavior), the browser is pretty efficient at restoring data; and by data, we mean the exact configuration of open windows and subjacent tabs. However, if the browser crash was due to too many open Chrome instances (that were not supported by the PC's configuration), or even worse, a webpage that sent virus/malware alerts, you risk (when Chrome restores the previous session), having the same problem and as a result, Chrome crashing again.
Tabs Outliner is useful in this case because it helps the user to restore, selectively, each individual page, by clicking it. The tree structure remains saved and available, but the browser enhancer prevents all of the pages from starting to load simultaneously (unless you click differently).
This Chrome extension is an excellent choice for all users. First and foremost, it works really well and has a bunch of useful options. Secondly, it is free and offers a lot of features that other add-ons require money for.
Also, Tabs Outliner even comes up with some nice extras that distinguish it from the plenitude of Chrome add-ons. For example, by right-clicking a tab-instance, you can see (in an overlay) all the available keyword commands. Also, tree structures can be printed or exported in an HTML format, or the tab lists can be annotated (with notes/comments).