Add alert/help msg for injected provider not found when wanting to switch context
Add alert/help msg for injected provider not found when wanting to switch context

Yann-Liang/browser-solidity,Yann-Liang/browser-solidity,Yann-Liang/browser-solidity,serapath-contribution/browser-solidity,soad003/browser-solidity,serapath-contribution/browser-solidity,serapath-contribution/browser-solidity,soad003/browser-solidity,soad003/browser-solidity