
Is there any way to have Firefox go back to showing a new tab in the tab bar (i.e.

This will add all the currently open tabs in the list of home pages. Go to the 'General' tab and click on 'Use Current Pages' button. Once they are all loaded, from the Firefox menu bar go to 'Tools->Options' ('Edit->Preferences' in Linux). Is there any way to have Firefox go back to showing a new tab in the tab bar (i.e., just to the right of the last open tab) with just a "+" showing, all the time? First, open all the web sites you want to open together in separate tabs. I did restore a tiny "+" sign in the upper right of the screen after I used the "Restore Defaults" but still do not automatically get an blank tab at the right of the open tabs in the tabs bar to make it easy to open a new page without over-writing one that is open, so that was a useful suggestion. It also had "+" in the last space on the list to open a new tab. It was a very useful program as it arrayed all open tabs as a list in the left sidebar rather than on top, so it gave an excellent picture of tab status and helped me manage tabs and remember to close those I did not need. When I upgraded to FF 39 I got an error message saying it was not supported so I presume it was not even installed. Its name was something like "list open tabs in sidebar" but I now cannot find it on the plugin/extension menus.

"What is the sidebar tabs add-on you're using? In case it is breaking things, could you try disabling or removing it?" Thank you, jscher2000 and cor-el for your help.
