GMail Label Switch Shortcuts

Adds keyboard shortcuts to select next / previous label in GMail (things like"Inbox" / "Drafts" / categories / custom labels). Specifically, "J" (shift + j) will select the next label, and "K" (shift + k) will select the previous label. If you find this extension useful, feel free to show your appreciation at https://www.buymeacoffee.com/mgsloan