Disable harmful JavaScript behaviors
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This is a userscript that helps disable harmful web development behaviors. Right now, this script:

  1. Disables programmatic selection of text (under most cases, I haven't figured out some corner cases).
  2. Disables programmatic access to the clipboard.

In the future, this script intends to do more, such as replacing common non-native controls with the standard HTML ones.

It has been tested with the Guerilla Scripting extension for Pale Moon.