diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 56afb80b..d8ac798e 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -34,8 +34,11 @@ You can help us translate the extension on [Transifex](https://www.transifex.com
 * Make any changes within a branch of this repository (not the `master` branch).
 * Submit a pull request and include a reference to the initial issue with the discussion.
 
-## Scripts
+## Build scripts
 
+See [Build.md](../Build.md) for more information.
+
+* `npm test` - Run ESLint and web-ext lint test. Please run this command and ensure there is no syntax errors before sending a PR.
 * `npm run lint` - Run ESLint on all JavaScript files.
 * `npm run update` - Runs update-node & update-main scripts.
 * `npm run update-quick` - Updates development dependencies (uses `npm update`; does not include new dependencies).
diff --git a/BUILD.md b/BUILD.md
new file mode 100644
index 00000000..9a4656a4
--- /dev/null
+++ b/BUILD.md
@@ -0,0 +1,63 @@
+# Build this project
+
+## Preparation
+
+1. Install [Node.js](https://nodejs.org/en/).
+2. Go to the project root, run `npm install`. This will install all required dependencies.
+
+## Generate the ZIP release
+
+Use the following command to generate a ZIP file that can be submitted to AMO or CWS:
+
+```
+npm run zip
+```
+
+The zip file includes all the files from the repository **except**:
+
+* All dot files (e.g. `.eslintrc` & `.gitignore`).
+* `node_modules` folder.
+* `tools` folder.
+* `package.json` file.
+* `package-lock.json` and/or `yarn.lock` file(s).
+
+<!-- FIXME: is this statement still true?
+* `vendor/codemirror/lib` files. This path is excluded because it contains a file modified for development purposes only. Instead, the CodeMirror files are copied directly from `node_modules/codemirror/lib`.
+-->
+
+## Tag a release/Bump the version
+
+Use the `npm version (major | minor | patch)` command to tag a release.
+
+There are some scripts that will run automatically before/after tagging a version. Includes:
+
+1. Test.
+2. Update version number in `manifest.json`.
+3. Generate the ZIP file.
+4. Push the tag to github.
+
+## Translation
+
+We host transalation files (`message.json`) on Transifex. To pull files from Transifex, run
+
+```
+npm run update-locales
+```
+
+To push files to Transifex:
+
+```
+npm run update-transifex
+```
+
+## 3rd-party libraries
+
+3rd-party libraries are managed by `npm`. Since Stylus is built with vanilla JS, we only use libraries that can run in the browser.
+
+We keep a copy of these libraries inside the `vendor` directory so users can side-load this repository without executing the build script. These files are downloaded from CDN or pulled from npm (`node_modules`).
+
+To add/update a library to the latest version, run `npm install PACKAGE_NAME@latest`.
+
+To remove a library, run `npm uninstall PACKAGE_NAME`.
+
+After the (un)installation, run `npm run build-vendor` to rebuild the vendor folder.
diff --git a/package.json b/package.json
index 4157f6f1..20db9e24 100644
--- a/package.json
+++ b/package.json
@@ -36,7 +36,8 @@
     "zip": "node tools/zip.js",
     "start": "web-ext run",
     "preversion": "npm test",
-    "version": "sync-version manifest.json && git add ."
+    "version": "sync-version manifest.json && git add .",
+    "postversion": "npm run zip && git push --follow-tags"
   },
   "engines": {
     "node": ">=10.0.0"
diff --git a/vendor/README.md b/vendor/README.md
deleted file mode 100644
index 9c519da7..00000000
--- a/vendor/README.md
+++ /dev/null
@@ -1,41 +0,0 @@
-# Vendor files are populated by the build script:
-
-## What the build script does
-
-Using this repo, run `npm install`... the latest versions of:
-
-* `CodeMirror` (https://github.com/codemirror/CodeMirror) is installed.
-* `jsonlint` (https://github.com/zaach/jsonlint) is installed.
-* `less` (https://github.com/less/less.js) is installed.
-* `lz-string-unsafe` (https://github.com/openstyles/lz-string-unsafe) is installed.
-* `semver-bundle` (https://github.com/openstyles/semver-bundle) is installed.
-* `stylus-lang` (https://github.com/openstyles/stylus-lang-bundle) is installed.
-* `usercss-meta` (https://github.com/StylishThemes/parse-usercss) is installed.
-* The necessary build tools are installed; see `devDependencies` in the `package.json`.
-
-## Running the build script
-
-Use `npm run update` to first update the packages in the `node_modules` folder & then update the vendor folder.
-
-The following changes are made:
-
-* `CodeMirror`: Only existing files are updated directly from the `node_modules` folder; see the [CodeMirror readme](codemirror/README.md) for specifics.
-* `jsonlint`: The uncompressed `lib/jsonlint.js` is copied directly to `vendor/jsonlint`.
-* `less`: The compressed `dist/less.min.js` file is copied directly into `vendor/less`.
-* `lz-string-unsafe`: The compressed `lz-string-unsafe.min.js` file is copied directly into `vendor/lz-string-unsafe`.
-* `semver-bundle`: The `dist/semver.js` file is copied directly into `vendor/semver`.
-* `stylus-lang-bundle`: The `stylus.min.js` file is copied directly into `vendor/stylus-lang-bundle`.
-* `usercss-meta`: The `dist/usercss-meta.min.js` file is copied directly into `vendor/usercss-meta`.
-
-## Creating the ZIP
-
-Use `npm run zip`.
-
-This command creates a zip file that includes all the files from the repository **except**:
-
-* All dot files (e.g. `.eslintrc` & `.gitignore`).
-* `node_modules` folder.
-* `tools` folder.
-* `package.json` file.
-* `package-lock.json` and/or `yarn.lock` file(s).
-* `vendor/codemirror/lib` files. This path is excluded because it contains a file modified for development purposes only. Instead, the CodeMirror files are copied directly from `node_modules/codemirror/lib`.