Don't panic. Instead, check the top of this page for a message that Firefox blocked the installation. (
screenshot)
If the installation was blocked, follow the instructions below. (If the installation was not blocked and you're still having
trouble,
read this).
To unblock installation from Google:
1. Click "Edit Options..." in the bar at the top of the page. (
screenshot)
The Firefox "Allowed Sites" window will appear.
2. Enter
tools.google.com in the box under "Address of web site." (
screenshot)
3. Click "Allow" to add Google to the list of allowed sites, then click "OK."
4. Click "Agree and Install" a second time to begin installation.