Complex sentence: The zoom control sequences (CTRL and + to increase, CTRL and-to decrease) are the same in FF, Opera and IE. In FF and Opera, there also menu items for zoom, which show the control sequences.
Split into simpler sentences: The zoom control sequences (CTRL + to increase, CTRL-to decrease) are the same in Firefox, Opera and Internet Explorer. In Firefox and Opera, there also menu items for zoom, which show the control sequences.