When I have an idea, it usually requires one or two pieces of information from the internet to implement.

So while I am still actively having that idea, I try to quickly open a browser tab on my phone and search for that thing. There, it can’t just disappear now!

(Side effects may include some browser tabs that are difficult to interpret. But most are pretty clear.)

Had a great idea, tabbed out to write it down, dissociated for 5 mins trying to remember why I tabbed out, gave up in frustration, and the same instant I loaded back into what I was doing before I remembered my idea. Just happened to me a few minutes ago, 2nd time was the charm though