Keep getting Firefox is offline msg

Since the recent upgrade, when I open Firefox, it'll load, but when I try to do anything, I get the offline msg and told to click "try again." I do, and then things are fine, but I don't like having to take this extra step. Looked under File on the menu; Work offline is not checked. Went to the about:config page; set value of network.manage-offline-status to false. Set browser.offline value to false. Set browser.offline-apps.notify to false. Opened Terminal and typed /Applications/Firefox.app/Contents/MacOS/firefox-bin -p in the window that opened. Work offline was not checked. Still get the same result.