Actually, it's not possible to choose what action to perform. After selection, nothing is displayed and it always opens new tabs. Also, multilinks had the ability to do multiple selections in a row. SLP ends the selection right after the mouse button is released. Too bad.
For now, the best solution for me is to stick with FF 56.0.2 and legacy versions of my favourite extensions.
TO USER: Best of I used!! already: custom key to hold TBC : delay in opening! delay in opening! delay in opening! waiting so long~~~ source: [Feature Request: Optional Delay For Opening Each New Tab · Issue #114 · cpriest/SnapLinksPlus](https://github.com/cpriest/SnapLinksPlus/issues/114)
Snap Links just stopped working on my FF63. Found I'm running version 22.214.171.124. Now I can see v3.1.4 released in Nov.2018. Does anyone know how to install new version? Snap Links addon page just installs v 126.96.36.199 and no way to update. What the fk???
Updated review: Manually installed v3.1.3 and now it works again. Fantastic!!
It stopped working for me too with FF 63. Then I noticed I was running some old version (probably auto update didn't work). Uninstalled, reinstalled to get the latest version and it's working again with FF 63.