'''Found my own answer: ''' The update to Firefox version 34.0.5 changed the way zoom works for the New Tab page. My visited sites are being saved, but I have to zoom out several levels to see them. I have to do this ''every time ''I open the New Tab page. To customize the default zoom for my tabs, I tried the NoSquint add-on first. It worked for every page except the New Tab page. '''Google search for:''' firefox new tab page zoom add-on '''Returned:''' Default FullZoom Level :: Add-ons for Firefox Default FullZoom Level→User Reviews→'''Find On This Page search for:''' New Tab Page '''Returned: '''"...this extension applies the selected default zoom in the preferences to the new tab page..." Firebird, ''a Firefox user'' The Default FullZoom Level add-on has resolved my issue.