Your comments

I'm closing this, as there's nothing I can do about the report.
If you want to get this solved, you'll have to provide more information so I can reproduce the issue.
If the update of Clover caused the issue, isn't it more logical to contact the Colver author about it?
Having said that, I'll look at it when I'll have the chance.
Hi,
OK, so the problem is that the "Open file location" item on Shift+Right click doesn't always exist, right?
I'm afraid I don't know how to solve this.
I can't reproduce it. Also, from the comments it seems like it works for other users.
Please provide more information, such as a screenshot, your tweaker's options, and the taskbar properties. Otherwise, I can't do much with your report.
Does the tweaker itself crash, or does explorer crash? Can you provide a crash report?
How do I find event logs when a program crashes?
What do you mean by "it doesn't mess with context menu of Jump List"?
Looks like that's exactly what it does - it provides a way to manage the Jump List.

As far as I know, the HKEY_CLASSES_ROOT items affect the right click menu of files, and have nothing to do with the jump list.
My guess is that you've set Firefox to always show labels.
Please open Taskbar Inspector, right click the Firefox AppId, and check your settings.