Update README.md to add links to Firefox/Chrome web stores, supported pages table

Signed-off-by: Laura Brehm <laurabrehm@hey.com>

Author: laurazard

README.md

@@ -10,12 +10,26 @@
 
 ---
 
+### Looking to install the extension?
+
+- **Chrome/Edge**
+- [**Firefox**](https://addons.mozilla.org/en-US/firefox/addon/docker-dev-environments/)
+
+---
+
 Allows you to quickly jump from a Git repo, branch or PR to a local development environment with the tools you need to test and run your workload — using [Dev Environments](https://docs.docker.com/desktop/dev-environments/) — by adding a button to Github, Bitbucket and Gitlab, in your browser.
 
-<img src="https://github.com/docker/dev-envs-extension/raw/main/docs/button_github_example.png" />
+<img src="./docs/button_github_example.png" />
+
+<br>
 
-Supports [Firefox](https://addons.mozilla.org/en-US/firefox/addon/docker-dev-environments/), Chrome and Edge.
+### Supported Pages
 
+| Provider  | Repo               | Branch             | PR                 |
+| --------- | ------------------ | ------------------ | ------------------ |
+| Github    | :white_check_mark: | :white_check_mark: | :white_check_mark: |
+| Bitbucket | :white_check_mark: | :white_check_mark: | :x:                |
+| Gitlab    | :white_check_mark: | :white_check_mark: | :x:                |
 
 ## Contributing
 
@@ -27,14 +41,14 @@ Unit tests can be ran with `yarn test`. Please remember to add/update tests when
 
 The extension can be built with `yarn build`. You can find instructions on installing an extension temporarily for Firefox [here](https://extensionworkshop.com/documentation/develop/temporary-installation-in-firefox/). For Chrome, check out this [guide](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
 
-
 ## Publishing
 
 The extension can be packaged with `yarn package`. Running this will output `dev-envs.xpi` and `dev-envs-source.zip`, which are the extension and source bundle respectively which can be uploaded to the [Chrome Web Store](https://chrome.google.com/webstore/category/extensions) and [Firefox Addons](https://addons.mozilla.org/en-US/firefox/).
 
 Don't forget to update the version in `manifest.json` before building a new version.
 
+<br>
 
 ---
 
-You are free to copy, modify, and distribute **Dev Environments Extension** with attribution under the terms of the Apache-2.0 license. See the LICENSE file for details.
+_You are free to copy, modify, and distribute **Dev Environments Extension** with attribution under the terms of the Apache-2.0 license. See the LICENSE file for details._