How can I universally disable titles on hover in Safari?

Question

How can I prevent tooltips from appearing when I hover elements with the title attribute, in Safari 14 on macOS Big Sur?

Answer 1

You can change the delay for all Safari tooltips by setting NSInitialToolTipDelay. If you set a really long time, it's like they're disabled. For example, 10 seconds:

defaults write com.apple.Safari NSInitialToolTipDelay -int 10000

Delete to use the default value

defaults delete com.apple.Safari NSInitialToolTipDelay

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Safari stores preferences in its sandbox container and defaults will only look in the container if you don't have a preferences file from a time when Safari wasn't sandboxed (e.g. if you've upgraded macOS and kept your home directory). Check you don't have a ~/Library/Preferences/com.apple.Safari.plist file for defaults to use the one at ~/Library/Containers/com.apple.Safari/Data/Library/Preferences/com.apple.Safari.plist, or manually provide this domain to defaults:

defaults write ~/Library/Containers/com.apple.Safari/Data/Library/Preferences/com.apple.Safari NSInitialToolTipDelay -int 10000