Why does Yahoo cover weather in uper right had corner and the clocks do not show up.
the weather information used to be along the bottom bottom but now are in the upper right had corner. The clocks of different countries use to be on the bottom also but now are no where to be found.
Alla svar (1)
Sounds like you may have installed a Persona that has "Yahoo" in that position of the window.
You can revert to the Default theme (Tools > Add-ons > Themes).
See Use themes to change the look of Firefox and http://kb.mozillazine.org/Themes (Lightweight theme)
As far as the clocks, hit {Ctrl + /}. That will un-hide the Add-on bar.