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Thank you @Gleb, but as an advanced users I already know that.
If you look closely, what I ask for is a button for each Speed Dial site, to open that site in Current tab. Open in new tab is easy with Ctrl or Shift click, but how do you open in current tab, except Right click and choose "Open in tab" -> It's 2 clicks away and I want it to have a visible 1-click.

Thank you for prompt reply, I see the that setting, but it's either choosing A or B in setting. What I really want to have is the options to do that in each Speed dial site. For example: clicking on each site will open new tab, but it has a button to open in current tab. Is it possible?