function getVendorsList() {
						var allVendors = Object.keys(vendorsDB);
						var vendors = prefs.getArray('caniuse.vendors');
						if (!vendors || vendors[0] == 'all') {
							return allVendors;
						}

						return intersection(allVendors, vendors);
					}
Returs list of supported vendors, depending on user preferences
@return {Array}