scriptlet support
Does Firefox deny user-script permission inside its sidebar? I found my user-scripts don't work in Webpage-Sidebar nor in a similar sidebar AddOn. Is this issue about supporting user-scripts or are 'scriptlets' something different?
This issue was for bookmarklet which is a bookmark with a script, If I remember correct.
As far as I know, The page this addon is utilizing is actually for addons itself, not for navigating web pages. so, Some limitaion could be there. (I didn't investigate that)
To workaround it, There is option for bookmark, wait, I can't find that; It looks like removed at some point. Firefox 63