Currently Firefox View lacks a search function
Example from Tab Manager Plus
Tab Manager Plus is missing a "clear search" function
Here are some nice things you can do with this
Drag these tabs as a group, to a specific window
You can press the following button, to move all selected tabs to a new windows
You can press the following button to close all these tabs
You can also Pin, Discard, Hide Tabs
You can add or remove to the selection with right click, and groups of tabs with shift click