I’ve recently switched back to using Firefox 4 beta from Chrome as the hardware accelerated rendering finally works on my laptop and it seems a lot less bloated and stable. However, I couldn’t find an option to force links that have been middle-clicked to open in a background tab – the default behaviour for a middle click is to open the link in a new tab which is immediately brought to the front.
The solution is to change one of the settings in the about:config page, which can be reached by entering ‘about:config’ in the address bar in Firefox. Then, enter ‘browser.tabs.loadDivertedInBackground’ into the Filter field which will display the setting. Double click and it will change to true:
Update 22/3/11: Since installing the final version of Firefox 4, I had to find the setting to change to open bookmarks in the background – this is ‘browser.tabs.loadBookmarksInBackground’.