I like Synapse but why not use Albert or Mutate ?
In Synapse if you whant to open lets say www.google.com you need to go the the web tab and so one.
Albert have a ppa made by webup8
sudo add-apt-repository ppa:nilarimogard/webupd8 && sudo apt-get update && sudo apt-get install albert
Mutate have a ppa made by noobslab
sudo add-apt-repository ppa:noobslab/apps && sudo apt-get update && sudo apt-get install mutate`