This error is usually caused by an add-on for Firefox that interferes with your ability to sign into your library's OverDrive website. The add-on that usually causes this error is called "RefControl." Follow the steps below to troubleshoot your sign-in issue.
Here's the complete error message:
The following system error occurred...
Error number: 12
Reference ID: e43d3134-5170-439c-b3a1-97b4827bb263.
Error message: An error occurred processing the request.
How to fix it
- Try disabling "RefControl" by going to Menu > Add-Ons.
- From the Extensions tab, look for "RefControl," then click Disable.
Restart Firefox if asked.
- Once "RefControl" is disabled, try signing in again.
If this works, make sure "RefControl" is disabled whenever you want to sign into your library's OverDrive website.
- If you still can't sign in, disable all of your add-ons.
- Try signing in again.
If you had to disable all of your add-ons to sign in, try re-enabling them one at a time. Sign in each time you enable a new add-on until you find the one that's causing the issue. That way, you'll know which to disable when you want to visit your library's OverDrive website in the future.