I get the use-case for this application, however I don't think I would want to run another browser in the background as a 290MB toolbar app to be searching GitHub PRs and issues makes sense to me. As a native app, yes but something like Electron is overkill for this use case.
After all, I still have too many Electron apps running on my Macbook hitting my swap space while I use Chrome to browse the web, so I can't have yet another one doing the same thing.
