Normal tabs and App tabs that you reopen automatically in the next session will be reloaded from the cache and need to be refreshed to get the current content, if that is what you do.

Reload web page(s) and bypass the cache.

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Cmd + Shift + R" (MAC)

I dont use tabs and only use the Yahoo toolbar bookmarks(about 200)they dont show up in the Firefox or IE bookmarks.After starting Firefox from being offline these dont open.From the pulldown button in the toolbar I go to tools>then refresh bookmarks sometimes several times for them to open all the way for normal use.It was'nt until the more recent updates this started happening.Another thing started happening at the same time in the Yahoo mail when trying to delete mail from the spam and trash folders when you select all>delete the cursor would go right to the to the OK button.Now I have to drag it to the button.this only happens in Firefox in Yahoo mail.

   Thanks for your fast reply