Hello,

If you are running 10.6 or 10.7 version AND your Firefox version is below 60, for example 56, then you need to reinstall my add-on (make sure to backup your dials first). Sadly the new version released today is no longer compatible with unsupported versions of Firefox and you need at least Firefox 60 ESR.

So you have two options now:
1) upgrade your Firefox to at least Firefox ESR 60 or current release 62.
2) install older version of my add-on 10.5 from this page: https://addons.mozilla.org/en-US/firefox/addon/groupspeeddial/versions/
(but you will need to uninstall current version first - also make sure to create backup of your dials before you uninstall it!).

However since your Firefox 56 is no longer supported by Mozilla - I'm strongly recommending you to upgrade your Firefox. Your version 56 doesn't contain any security updates released in version 57 and above.

Also if you have more issues, please contact me to my support e-mail.

Best regards,
Juraj Mäsiar