Mockup, 6 Oct. The browser's search and site pages, each site looking like itself, and a polish pass on Notes. Drawn with the approved copy.
One question settles it: can you count the thing?
Use fewer for things you can count: fewer calls, fewer emails, fewer than ten items.
Use less for things you can't: less noise, less time, less water.
Related: Affect vs. effect · Its or it's?