Simple Tab Manager od Anubosiris

This extension opens a popup, which extracts all urls from all currently opened tabs for display an some nice functionality:
[copy]-button: Copy all urls directly into the clipboard
[paste]-button: Read all lines from the clipboard and open them in new browser tabs

This addon doesn't use any background functionality and doesn't communicate with any server. Therefore, it will not affect the performance of your system and since data are processed local only, they are as safe as your browser itself.

The source code can be found at: https://github.com/Develaupair/simple-tab-manager