Doesn't work as stated, I even tried it on a clean install. The old Right Links by Infocatcher worked great. No longer available but if you change your useragent to FF 52, it will show up and you can get a beta version for FF 57+ that opens links with long left or right click in new tab. Or find it here...

https://addons.mozilla.org/en-US/firefox/addon/right-links/versions/beta

нет иконки на таскбаре,чтоб быстро отключить правый клик

Is there any way to open multiple links with this extension ?

I couldn't find a way to reply to your comment on my review other than writing yet another review, so I'll answer your question this way.

These are the other extensions I'm running:

Adblock Plus
AdF.ly Skipper ★WORKING: 9/13/2017★
Color Picker
Enhancer for YouTube™
F.B Purity - Cleans up Facebook (WX)
Measure-it
New Tab Tools
Persona Switcher
Personas Plus
Personas Rotator
Print Edit WE
Reload in address bar
Save Image to Downloads
Take Webpage Screenshots Entirely - FireShot
Webmail Ad Blocker

Can I open the tabs in rightmost rather than in the right ?

have to do cntrl+right click to get functionality; regular right click still normal context menu

i.e. the opposite of the description, and much less user friendly

Browser does not switch to new tab.