Add strike list image to README

README.md

@@ -2,7 +2,8 @@
 
 A browser extension that alerts you when you navigate to a website belonging to an organization whose employees are on strike. You can then click on the notification to learn more about the strike.
 
-<img src="https://github.com/jamespizzurro/picket-line-notifier/raw/main/screenshots/chrome-notification.png" alt="A screenshot of wirecutter.com with a notification from this browser extension rendered over it indicating that Wirecutter's employees are on strike and that one can click the notification for more information.">
+<img src="https://github.com/jamespizzurro/picket-line-notifier/raw/main/screenshots/chrome-notification.png" width="800" alt="A screenshot of wirecutter.com with a notification from this browser extension rendered over it indicating that Wirecutter's employees are on strike and that one can click the notification for more information.">
+<img src="https://github.com/jamespizzurro/picket-line-notifier/raw/main/screenshots/firefox-strike-list.png" height="325" alt="A screenshot of a list of active strikes, each with a link to more information, that can be accessed by clicking the extension's icon in your browser's toolbar.">
 
 ## Installing