Type '''about:preferences#general'''<enter> in the address bar. Under '''Tabs,''' turn on '''Open New Window In New Tab'''

Are these links inside a Firefox window and you want a new tab in that window? Usually, that happens, but you could check this setting to see whether it changed: "3-bar" menu button (or Tools menu) > Options In the left column, if General is not already selected, click General. Then on the right side, toward the bottom of the list, make sure there is a checkmark next to "Open new windows in a new tab instead" Is that not working? Is there a specific site where you have this problem? Sites can specially code links to open in a new window by specifying some features of the window (for example, height and width, no scrollbar, etc.). There is a hidden setting to force even those scripted windows into a new tab instead. Here's how you set it: (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) There are three similarly named preferences for different scenarios, we're going to focus on the second one, but I mention the others in case you have a question when you see them: <strong>(A) browser.link.open_newwindow</strong> - for links in Firefox tabs 3 = divert new window to a new tab (<u>default</u>) 2 = allow link to open a new window 1 = force new window into same tab <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 setting that second preference to a value of 0 make any difference?