Firefox

This is absolutely false. In a standard browser environment you are going to require a multitude of plugins to achieve various tasks. In fact; having uBo installed is in and of itself fingerprintable to the n^th^ degree. An advanced fingerprinting suite can glean data from your browser based on which uBo lists you subscribe to.

With the sole exception being purpose-hardened browsers like Mullvad's or Tor Browser; there is no reason to skip having plugins. You already fingerprinted yourself by running that one plugin.