Implement sidebar design in firefox

[rftw]

Hello,

Thank you for this great extension.

I am writing to request a sidebar implementation so that users can use this extension in firefox sidebar pane. Currently it is only available as popup. A problem with popup implementation is once the user clicked on a search result, it takes to the relevant tab and immediately closes the popup. I want the results window in the popup to persist to be able to navigate the tabs one by one until I found the correct tab. However since the popup closes immediately, I have to initiate a new search and type the search phrase again. A sidebar implementation in firefox is perfect for this use case since it will not close the extension unless the user wants to.