Prevent/disable sleep on fire TV stick

Hi, so I have a fire stick, which I need to relay a single website on constantly for a company, but the thing is, even though firefox is open the stick will go to sleep mode. I sorta need this turned off, I understand there is a way to do this via adb commands, could anyone explain this further? I've tried tasker yet failed to even set up a profile as I couldn't hit the + button with the limited scrolling and functionality that accompanies the remote control with the stick.

any help is appreciated,

thanks!

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