Open your browser and load the appropriate development build. For example, if you are developing for the chrome browser, using manifest v3, use: `build/chrome-mv3-dev`.
You can start editing the popup by modifying `popup.tsx`. It should auto-update as you make changes. To add an options page, simply add a `options.tsx` file to the root of the project, with a react component default exported. Likewise to add a content page, add a `content.ts` file to the root of the project, importing some module and do some logic, then reload the extension on your browser.
The easiest way to deploy your Plasmo extension is to use the built-in [bpp](https://bpp.browser.market) GitHub action. Prior to using this action however, make sure to build your extension and upload the first version to the store to establish the basic credentials. Then, simply follow [this setup instruction](https://docs.plasmo.com/framework/workflows/submit) and you should be on your way for automated submission!