A tree style tab navigator

Refer https://github.com/xingtanzjr/Tree-Style-Tab

【New-Feature】：
 Quick Search. 
If no tab is selected, pressing `ENTER` can search the keyword on the Internet directly!

【Shrot-cut】：
    • Alt+Q : Open Tab-Tree. (You can also set your own shortcut for that)

    • ↑ (Arrow-up): move to previous tab 
    • ↓ (Arrow-down):move to next tab
    • ⏎ (Enter): switch to selected tab. If no tab is selected, it will search the keyword on the Internet
    • Alt + w: close all sub tabs for selected tab

【Introduction】:
    Tab-Tree is aimed to solve a very simple but annoying problem, that is, how to switch to the tab you want quickly if your window opened lots of tabs.

    What Tab-Tree different from others is that Tab-Tree gives a tree-style list for tabs. This tree separates all tabs into different groups by the relationship between the child-tab and their parent-tab, which gives you a better insight for all the tabs. All the tabs opened by same tab will become the children of the tab which opens them.

【Other Features】:
    • Search: search all opened tabs by keyword.
    • Bookmarks: search your bookmarks and open the bookmark in a new tab quickly.

【NOTICE】:
    Tabs which was opened before installing this extension could not be showed in a tree view."