Even though the development of this add-on seems to have stopped at the compatibility with Firefox version 36 (current version is 40), it works for me! I just installed it and have used it successfully at its default settings. This add-on, though, has a zillion options that are supposed to make it VERY versatile. Hopefully the developers are going to keep this add-on up to date!
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)