kmanek
Let's do in this way , we will change Orange default color with your brown color
Go to this file /templates/ja_focus/less/variables.less and find this line of code around line 79
@orange:#808080;
Change #808080 with your hex brown color value , save the file
Go to Extensions -> Templates -> Ja_Focus-> and click on Less to Css button
Now you have switched Orange color from Orange default to your brown color.
Hope it helps