Type '''about:preferences#general'''<enter> in the address bar. Under '''Tabs,''' unmark '''Open new windows in a new tab instead.'''

If this problem is on a search engine results page, it may be a setting you can modify. For example: * If it's Google, could you check this page: https://www.google.com/preferences * If it's DuckDuckGo, could you check this page: https://duckduckgo.com/settings * If it's another site, please check the settings available from the results page to see whether the site is set to launch results in a new window. If it's a different site, you're probably at their mercy. They may be using either: (A) Link target attribute (e.g., target="_blank") (B) window.open script method To force links targeted toward a new window back into the same tab, you can change a hidden setting: (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> 0 = apply the setting under (A) to ALL new windows including script windows with features (dialog 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 ''You might want to choose 2 for this one after testing the first change.'' Does that do what you want?