Hi - have you tried clearing your cache, cookies, etc?

Normally, Firefox diverts links that open a new window to opening a new tab instead. There also is a stricter setting to keep links that open in a new window in the same tab. You can still direct a link to a new tab yourself using the right-click menu. '''(1)''' In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.'' '''(2)''' In the search box in the page, type or paste '''neww''' and pause while the list is filtered '''(3)''' Review/Edit the preference values as follows (double-click the current value to open an editing field, and then when you're done, press Enter or click the blue checkmark to save the change): (A) '''browser.link.open_newwindow''' - ''for links in Firefox tabs'' This is the one that has a checkbox on the Preferences page and determines whether targeted links are allowed to open in a new window or are diverted to a new tab instead; there's no effect on untargeted links: * 3 = divert new window to a new tab (default) * 2 = allow link to open a new window * '''1 = force new window into same tab''' (B) '''browser.link.open_newwindow.override.external''' - ''for links in other programs'' This preference governs those external links that open in Firefox -- if you do not want them to replace the page you were viewing in the last active tab, change this setting: * -1 = apply the setting under (A) to external links (default) * '''3 = open external links in a new tab in the last active window''' * 2 = open external links in a new window * 1 = open external links in the last active tab replacing the current page (C) '''browser.link.open_newwindow.restriction''' - ''for links in Firefox tabs'' By default, if a page sets width, height, or toolbars for a popup, Firefox will open it in a "dialog-style" window. To force those into a tab as well, you can change this preference to 0, but I suggest saving this for future tweaking: * 0 = apply the setting under (A) to ALL new windows (even script windows with limited features) * '''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 To return to normal if things go haywire, there's an arrow-like reset button at the right end of each of those rows if it has a non-default value.