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Hi Stephen I downloaded what you recommended it say press the tool bar to change silly question but how do you press the tool bar ? thanks
 
Step 1 - enable the extension in Safari.
Safari menu > Preferences > Extensions > make sure there is a tick next to the "Dark Mode" extension
Screen Shot 2019-10-03 at 17.11.08.png


Step 2 - use the extension
Set your preferences for how it operates by clicking the extension's toolbar button:

Screen Shot 2019-10-03 at 17.13.52.png
 
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