A simple extension that plays the Windows Internet Explorer start and end navigation sounds, popup blocked and information bar sounds, feed and search provider discovered sounds, and download completed sound.
It includes no sounds of its own, it just tries to play the Windows ones.
Each of the sounds can be changed in the Windows Control Panel "Sounds":
Control Panel Sounds
File Explorer > Start Navigation
File Explorer > Complete Navigation
Blocked Pop-up Window
File Explorer > Blocked Pop-up Window
File Explorer > Notification bar
File Explorer > Feed Discovered
Search Provider Discovered
File Explorer > Search Provider Discovered
Windows > Asterisk
Note: In Windows 7 and earlier the "File Explorer" entry is called "Windows Explorer".
Navigational Sounds may be a very small extension (only 9KB currently), but there are many possible problems with it working. Below I will explain what you can do to try and help work out what is wrong.
Start Firefox with a single blank page, "about:blank" will do, though this procedure will work with any page - the important point is to open Firefox with only one tab.
Load the URL "about:config" into the Firefox window.
Make sure the Value is "true"; if it is not, double-click to change it. You can also use the context menu to change the value.
Right-click on each entry in turn that mentions "navsounds" and select Copy. Then paste the item into the e-mail.
Include as much information about your operating system as possible. If you are not sure what information to include, I suggest following these instructions:
Hold down the Windows key on your keyboard (the one with the Windows logo on it), then press the Break key. This should open a window titled "System Properties".
Type out all the information at the top, under the "System:" heading, into the e-mail. This will include the version of Windows, and the Service Pack installed.
Do not include anything below the "Registered to:" line, this is not relevant (or even any of my business!).
Close the window either with the X in the top-right corner, or the Cancel button, to ensure no accidental changes are made.
Send the e-mail. If you included a valid From e-mail address, I will most likely reply to thank you for the information. I may also ask for some extra information, or ask if you would try a special version of the extension to help diagnose the problem.