Firefox

don’t open tabs in new windows

source: https://support.mozilla.org/en-US/questions/1190923

(A) browser.link.open_newwindow - for links in Firefox tabs

• 3 = divert new window to a new tab (default)
• 2 = allow link to open a new window
• 1 = force new window into same tab <= Try this one

(B) browser.link.open_newwindow.restriction - for links in Firefox tabs

• 0 = apply the setting under (A) to ALL new windows (even script windows) <= Try this one
• 2 = apply the setting under (A) to normal windows, but NOT to script windows with features (default)
• 1 = override the setting under (A) and always use new windows

(C) browser.link.open_newwindow.override.external - for links in other programs

• -1 = apply the setting under (A) to external links (default)
• 3 = open external links in a new tab in the last active window <= Try this one
• 2 = open external links in a new window
• 1 = open external links in the last active tab replacing the current page