It's been a good morning already as I just made a handy accidental discovery. Hopefully it will work for others. It involves making the content of a web page larger or smaller. In the past I have done this by holding the CTRL key while rolling the scroll button on my mouse.

A "one-handed" way to accomplish the same thing is to place the cursor anywhere outside the web page. Click the scroll button. The magnify icon will appear. Move the cursor onto the web page and use the scroll button to increase or decrease the size of the contents. To cancel, left or right click the mouse anywhere on the screen.