Remove browserify dependency/bundler

[GrayedFox]

Project currently relies on browserify but it doesn't have to - the native extension way to "require" files is to break them up into content and background isolated logic and specify them in the manifest.json

• would likely need to split the helpers file into smaller parts with dedicated content and background methods
• would eliminate need to build/bundle files and make it easier to develop (can just watch and rebuild extension as normal)
• good time to also restructure and refactor existing code base into distinct, modular parts