If I’m developing a site locally and try to open an HTML file that’s located on my hard drive by either double clicking it or dragging it onto the Firefox dock icon, it opens in a new window. This obviously gets annoying if you are working on several files at once. Any way to force all files to open in a new tab rather than a new one?
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This option can be set in the Firefox preferences here http://support.mozilla.org/en-US/kb/tab-preferences-and-settings
You should also check the value of
browser.link.open_newwindowand make sure it is set to the default value of 2 – http://kb.mozillazine.org/Browser.link.open_newwindow.restriction