How to hide everything but the map ?

Hi, Looking at using Roll20 in real life. MacBook running Safari for the GM login and Firefox as a 'player' login. Is there a way to hide UI elements on the 2nd screen and just show the map grid and tool selector ? Has anyone done this and have any advice on getting the grid to show approximate 1inch squares ? Size of screen and resolution suggestions I guess for the standard Roll20 content (Currently setting up a campaign for Lost Mine of Phandelver) Thanks. 

There is an extension called stylish that people have used to do what you want for hiding browse UI's. There are some posts floating around the site about it. The other stuff, not sure but I'm sure someone with the information or suggestions will be along to help you.

Jon S. said: Is there a way to hide UI elements on the 2nd screen There's a JavaScript bookmarket at the bottom of the Using Roll20 while Playing In-Person Wiki page that can accomplish this.

Does anyone know how to use/make a javascript bookmarket on a mac? Either safari, chrome or firefox ? I tried using it as the bookmark 'address' but that didn't work. 

Some browsers require you to specifically type "javascript:" at the beginning of the URL. It cannot be pasted. Others require you to click a preference to allow code to be executed from the address bar. I'm not at my Mac right now, or I could be less cryptic/more helpful.

In chrome, you go to the Bookmarks Manager and add it there.  You can't add it from the address bar.