The upcoming release of Pale Moon version 27 will no longer support so-called Jetpack/SDK extensions for technical reasons. Moonchild created a (Windows only) Compatibility Checker tool that will check your default Pale Moon profile and indicate which of your extensions are SDK extensions so you can look into finding alternatives for them before v27 is released or know what will no longer work in Pale Moon 27 and later.
See v27 Compatibility Checking Tool - Pale Moon forum for Instructions and download information.
See v27 Compatibility Checking Tool - Pale Moon forum for Instructions and download information.