When to have many tabs open, the search among open tabs (and even history) would be appreciated. This has been done in Vivaldi browser where F2 opens floating window and while typing, it searches in real-time among open tabs and even from near history. Currently managing lots of tabs is very challenging. Also checked https://github.com/brave/browser-laptop/wiki/Brave-Browser-Shortcuts and could not find currently such search shortcut key. The F2 key could be a good choice to search among tabs and possibly even near history. This applies to all versions of Brave on different operating systems.
Using 64-bit Linux Mint 18.2
Update Channel dev
OS Platform Linux
OS Release 4.13.2-041302-generic
OS Architecture x64