This code is identical to https://github.com/lucusfly/iost-extension/
It uses an updated version of the IOST Software Development Kit
I did not modify any source files.
How to compile:

1. Install npm and nodejs.
2. npm i
3. npm run build:local
4. Go to chrome://extensions/
5. Turn on developer mode at the top right corner
6. Drag your /dist folder which generated from step 3 to the page.