fix: remove redundant/unused permissions (#849)
fix: remove redundant/unused permissions (#849)

Addressing review:
https://github.com/ipfs-shipyard/ipfs-companion/issues/808#issuecomment-590313139

(We no longer use alarms API and activeTab is superseded by  <all_urls>)
lidel/ipfs-firefox-addon,lidel/ipfs-firefox-addon,lidel/ipfs-firefox-addon