Most notably, web browsers.

I have quite sensitive headphones, so I keep the system master volume at around 20%, and the youtube video volume at around 20% as well. This is all great, but when I close and restart the browser and start watching a youtube video again, the sound is SUPER loud, even though the youtube volume slider is in the same place. If I open the system master volume knob and move it up or down 1 value, the program seems to realize it's not respecting the system volume and goes back to normal.

Any way to fix this?