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+## Setting up development environment
+
+### Installing dependencies
+
+The minimum requirements are:
+- GNU Bash
+- [GNU Coreutils](https://www.gnu.org/software/coreutils/)
+- Git
+- Node.js (version 16 and above)
+
+To install the project dependencies run
+
+```sh
+# install dependencies
+npm install
+
+# install rollup or use npx
+npm install -g rollup standard
+```
+
+
+## Style guidelines
+
+We use [StandardJS](https://standardjs.com/) with pre-defined ESLint rules to ensure a consistent coding style and catch potential bugs. For checking lint, run
+
+```
+npm run lint
+```
+
+
+## Linking Package
+
+```sh
+# without code minified
+npm build
+
+# with code minified
+PRODUCTION=true npm build
+```
+
+## Firefox Addon
+
+1. To build addon(after `dist/` is generated from `npm build`), run
+
+```sh
+npm run addon
+```
+
+2. Then go to `about:debugging` page in Firfox Browser, then press `This Firefox` for extension page
+
+3. Press `Load Temporary Add-on...`, then select `manifest.json` in `addon/`