I would like all links to open in the active tab, unless I command-click on the link.

Question

I've searched for answers to this question, and I was able to adjust the values for preferences in about:config so that all links open in the active tab, but after doing so I am unable to command-click to open a link in a new tab. Is there any way to change certain preferences so that command-clicking will override the browser.link.open_newwindow preferences? Or maybe there's some other way around this?
This might seem like an odd request, but several sites I use (Tumblr especially) open nearly all links in a new tab by default, and it quickly gets out of hand. A "same-tab unless command-click" configuration would allow me to control where every link opens. Also, I would still like all links from external applications to load in a new tab.
I'm using Firefox 32.0 on Mac OS X 10.9.4.
Thanks

Answer 1

Your request sounds similar to this old thread, except that you want a different setting for the third preference: [https://support.mozilla.org/questions/985943 How do I get when I click on a link it will not open in new tab? I want to open in the same tab where I clicked on that click.]
(1) In a new tab, type or paste <strong>about:config</strong> and press Enter. Click the button promising to be careful.
(2) In the filter box, type or paste <strong>link.o</strong> and pause while the list is filtered.
(3) Double click these to modify the values as desired:
<strong>(A) browser.link.open_newwindow</strong>
3 = divert new window to a new tab (<u>default</u>) (checked*)
2 = allow link to open a new window (unchecked*)
'''1 = force new window into same tab'''
<strong>*</strong> First checkbox in Options &gt; Tabs
<strong>(B) browser.link.open_newwindow.restriction</strong> - for links in Firefox tabs
'''0 = apply the setting under (A) to ALL new windows (even script windows)'''
2 = apply the setting under (A) to normal windows, but NOT to script windows with features (<u>default</u>)
1 = override the setting under (A) and always use new windows
<strong>(C) browser.link.open_newwindow.override.external</strong> - for links in other programs
-1 = apply the setting under (A) to external links (<u>default</u>)
'''3 = open external links in a <u>new tab</u> in the last active window'''
2 = open external links in a <u>new window</u>
1 = open external links in the <u>last active tab</u> replacing the current page
Does that combination work?