The issue is your browser-extension - it somehow did not update.
You need at least version 3.3.20!
Try uninstalling- and re-installing our myjd extension in your Firefox and check if it updates.
We do offer 3.3.10 at this moment but it should instantly auto-update to 3.3.20...
If all of this fails and you're unable to find out why your extension is not auto-updated, please try using a current version of chrome for captcha solving.
Just in case you want to use Chrome only for captcha solving but not as your main browser, check
this guide.
-psp-