I use this Firefox feature for floating video, always playing in the corner of one of the monitors.
> The Picture-in-Picture feature allows you to pop videos out of their webpages into floating, always on top, windows, so you can watch while continuing to work in other tabs.
https://support.mozilla.org/en-US/kb/about-picture-picture-f...
When I'm working, I only watch in my peripherals, if at all. Mostly I like listening to the film soundtrack, effects, and more or less indistinct human voices.
Somewhat counter-intuitively, I focus better this way, compared to having "silence" - because I have sensitive hearing, any slight or distant sound in the real world environment distracts my attention. I wear noise-cancelling headphones, whether any audio/video is playing or not.
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I have a little shell script for taking notes from the terminal command line. I use it throughout the day to to chronicle the endless number of ideas that flow through the brain. The notes go into a plain-text/Markdown journal file.
Before I started this practice a few years ago, I used to feel anxious that so many good ideas and thoughts were getting lost. Now, I just dump everything into notes as fast as I can type them in. Then I can set them aside, forget them and move on with my brainstorming.
Occasionally I review the journal, and copy the best parts into project or subject-based Markdown files.
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Emails only - checking once a day, or 2~3 times a week. No telephone, text or video chat.
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Edit: I haven't been diagnosed with ADHD, but I can relate to other comments in this thread - so might be leaning in that direction. Might also be a bit of an autist.