If you update to Joomla 3.8.10, please make sure that you either do a full GitHub update of Fabrik, or disable caching for your lists (in the Advanced settings) or turn off Joomla's System Cache setting. A change in Joomla's cache code in 3.8.10 required a fix in Fabrik, which will be rolled in to the next release, but is currently only available in GitHub.
Copying a plugin
Lets say we want to copy the list plug-in 'caneditrow' as a basis for us to start work on a new plug-in, called 'custom_can_edit'.
First of all copy the folder:
rename caneditrow.xml to custom_can_edit.xml
edit custom_can_edit.xml file and change the string in:
<name>Can Edit Row</name>
<name>Custom Can Edit Row</name>