diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7da7251..2871cff 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,7 +1,7 @@
 # Open in Colab Chrome Extension
 
-This is a chrome extension that allows notebooks on github to be opened in
-Google [Colaboratory](https://colab.research.google.com) in one click. See the
+This is a Chrome extension that allows notebooks on GitHub to be opened in
+[Google Colaboratory](https://colab.research.google.com) in one click. See the
 Colaboratory [FAQ](https://research.google.com/colaboratory/faq.html) for
 details.
 
diff --git a/README.md b/README.md
index 5221132..9cb54f1 100644
--- a/README.md
+++ b/README.md
@@ -1,28 +1,18 @@
-# Open In Colab Chrome Extension
+# Open in Colab Chrome Extension
 
-This is a simple chrome extension that, when clicked when viewing a Jupyter
-notebook on github, will open that notebook in
-[Google Colab](http://colab.research.google.com/).
+This is a simple Chrome extension that, when clicked when viewing a Jupyter
+notebook on GitHub, will open that notebook in
+[Google Colab](https://colab.research.google.com/).
 
 The extension simply provides a URL redirect: it reads the current URL and opens
-a new tab at http://colab.research.google.com/github/ with the user, repository,
-and notebook path.
+a new tab at https://colab.research.google.com/github/ (or /gist/) with the
+user, repository, and notebook path.
 
 ## Installing the Extension
 
 The latest release of the extension can be installed from the
 [Chrome Web Store](https://chrome.google.com/webstore/detail/open-in-colab/iogfkhleblhcpcekbiedikdehleodpjo).
 
-## Development Install
+## Support
 
-To install the extension directly from source:
-
-1.  Clone this repository to your local disk.
-2.  Open the Chrome browser, and navigate to chrome://extensions.
-3.  Ensure that developer mode is enabled (see the switch in the upper-right).
-4.  Click "Load Unpacked" and choose the location of the `open_in_colab`
-    repository. You should see a little colab icon appear in your Chrome
-    extensions icons in your browser bar.
-5.  Navigate to a notebook on github (e.g.
-    https://github.com/googlecolab/colabtools/blob/main/notebooks/colab-github-demo.ipynb),
-    and click the extension icon to open the notebook in Colab.
+For help with Colaboratory, see https://github.com/googlecolab/colabtools/.
diff --git a/js/background.js b/js/background.js
index b24ea9c..693a731 100644
--- a/js/background.js
+++ b/js/background.js
@@ -40,6 +40,7 @@ chrome.action.onClicked.addListener(function(tab) {
   if (url) {
     chrome.tabs.create({'url': url});
   } else {
-    alert('Current page is not recognized as a github-hosted notebook');
+    console.warn(`Current page (${
+        tab.url}) is not recognized as a GitHub-hosted notebook.`);
   }
 });