There is no system supported technique for disabling ctrl+ click from working as a secondary click in Mavericks.
You can utilize Karabiner Aspects to remap “Control+ LeftClick to LeftClick,” which basically disables this habits system-wide.
Action 1:
Install Karabiner Aspects:
https://karabiner-elements.pqrs.org/
Action 2:
When you then go to open Karabiner Aspects, it will have a couple security problems you require to deal with.
The very first will be to permit the setup of a kernel extension:
The 2nd will be to permit input tracking:
Action 3:
When those security problems are managed, you then require to include a complicated adjustment. Go to:
https://ke-complex-modifications.pqrs.org/#control_lclick_to_lclick
Then click Import on the Disable Ctrl Click adjustment:
This will include the intricate adjustment to Karabiner Aspects and make it possible for the performance:
Addendum:
Nevertheless, I do not understand of any web apps (and definitely not most or lots of) which do not acknowledge and regard Command+ LeftClick as a method to multi-select. That is the requirement for macOS.