Always limit the maximum number of actions to 2

[saschanaz]

Closes #110

• [ ] At least two implementers are interested (and none opposed):
  • Gecko
  • …
• [ ] Tests are written and can be reviewed and commented upon at:
  • …
• [ ] Implementation bugs are filed:
  • Chromium: …
  • Gecko: (N/A, actions are not supported yet)
  • WebKit: (N/A, actions are not supported yet)
• [ ] MDN issue is filed: …
• [ ] The top of this comment includes a clear commit message to use.

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