diff --git a/apps/homescreen/everything.me/js/Core.js b/apps/homescreen/everything.me/js/Core.js
index 9e81fef156a8..bbca3ab691fc 100644
--- a/apps/homescreen/everything.me/js/Core.js
+++ b/apps/homescreen/everything.me/js/Core.js
@@ -6,7 +6,7 @@ window.Evme = new function Evme_Core() {
 
   this.shouldSearchOnInputBlur = false;
 
-  this.init = function init(callback) {
+  this.init = function init(config, callback) {
     var data = Evme.__config,
         apiHost = Evme.Utils.getUrlParam('apiHost') || data.apiHost;
 
@@ -38,6 +38,7 @@ window.Evme = new function Evme_Core() {
     });
 
     Evme.DoATAPI.init({
+      'deviceId': config.deviceId,
       'apiKey': data.apiKey,
       'appVersion': data.appVersion,
       'authCookieName': data.authCookieName,
diff --git a/apps/homescreen/everything.me/js/api/DoATAPI.js b/apps/homescreen/everything.me/js/api/DoATAPI.js
index e89c2bd23214..9d9db850a15a 100644
--- a/apps/homescreen/everything.me/js/api/DoATAPI.js
+++ b/apps/homescreen/everything.me/js/api/DoATAPI.js
@@ -94,12 +94,7 @@ Evme.DoATAPI = new function Evme_DoATAPI() {
     authCookieName = options.authCookieName;
     manualCampaignStats = options.manualCampaignStats;
 
-    // temporarily generate a device id, so that requests going out before we
-    // took it from the cache won't fail
-    deviceId = generateDeviceId();
-    getDeviceId(function deviceIdGot(value) {
-      deviceId = value;
-    });
+    deviceId = options.deviceId;
 
     Evme.Storage.get(STORAGE_KEY_CREDS, function storageGot(value) {
       manualCredentials = value;
@@ -921,28 +916,10 @@ Evme.DoATAPI = new function Evme_DoATAPI() {
     return retParams.join(',');
   }
 
-  function getDeviceId(callback) {
-    Evme.Storage.get('deviceId', function storageGot(deviceId) {
-      if (!deviceId) {
-        deviceId = generateDeviceId();
-        Evme.Storage.set('deviceId', deviceId);
-      }
-
-      callback(deviceId);
-    });
-  }
-
   this.getDeviceId = function getDeviceId() {
     return deviceId;
   };
 
-  function generateDeviceId() {
-    var queryString = {};
-    (location.search || '').replace(/(?:[?&]|^)([^=]+)=([^&]*)/g,
-      function regexmatch(ig, k, v) {queryString[k] = v;});
-    return queryString['did'] || 'fxos-' + Evme.Utils.uuid();
-  }
-
   function cbRequest(methodNamespace, method,
                                             params, retryNumber, completeURL) {
     Evme.EventHandler.trigger(NAME, 'request', {
diff --git a/apps/homescreen/everything.me/js/everything.me.js b/apps/homescreen/everything.me/js/everything.me.js
index e73e9f38d2a5..306004343a02 100644
--- a/apps/homescreen/everything.me/js/everything.me.js
+++ b/apps/homescreen/everything.me/js/everything.me.js
@@ -327,8 +327,15 @@ var EverythingME = {
   },
 
   initEvme: function EverythingME_initEvme() {
-    Evme.init(EverythingME.onEvmeLoaded);
-    EvmeFacade = Evme;
+    var config = this.datastore.getConfig();
+    config.then(function resolve(emeConfig) {
+      EverythingME.log('EVME config from storage', JSON.stringify(emeConfig));
+
+      Evme.init({'deviceId': emeConfig.deviceId}, EverythingME.onEvmeLoaded);
+      EvmeFacade = Evme;
+    }, function reject(reason) {
+      EverythingME.warn('EVME config missing', reason);
+    });
   },
 
   onEvmeLoaded: function onEvmeLoaded() {
@@ -499,8 +506,8 @@ var EverythingME = {
       });
     } catch (ex) {
       deleteOld();
-      console.warn('[EVME migration] [' + oldKey + ']: error: ' + oldValue +
-                                                      ' (' + ex.message + ')');
+      EverythingME.warn('[EVME migration] [' + oldKey + ']: error: ' +
+                                            oldValue + ' (' + ex.message + ')');
       onComplete(false);
       return false;
     }
@@ -551,6 +558,11 @@ var EverythingME = {
     if (this.debug) {
       console.log.apply(window, arguments);
     }
+  },
+  warn: function log() {
+    if (this.debug) {
+      console.warn.apply(window, arguments);
+    }
   }
 };
 
@@ -562,3 +574,66 @@ var EvmeFacade = {
     return false;
   }
 };
+
+
+(function() {
+  'use strict';
+
+  // datastore to use
+  var DS_NAME = 'eme_store';
+
+  // id of config object
+  var DS_CONFIG_ID = 1;
+
+  // see duplicate in search/eme.js
+  function generateDeviceId() {
+    var url = window.URL.createObjectURL(new Blob());
+    var id = url.replace('blob:', '');
+
+    window.URL.revokeObjectURL(url);
+
+    return 'fxos-' + id;
+  }
+
+  function emeDataStore() {
+  }
+  emeDataStore.prototype = {
+    // Get or create config shared with search/eme instance via DataStore API.
+    getConfig: function getConfig() {
+      var promise = new Promise(function done(resolve, reject) {
+        navigator.getDataStores(DS_NAME).then(function(stores) {
+          if (stores.length === 1) {
+            var db = stores[0];
+
+            db.get(DS_CONFIG_ID).then(function success(emeConfig) {
+              // use existing config
+              if (emeConfig) {
+                resolve(emeConfig);
+              } else {
+                // store new config
+                emeConfig = {
+                  'deviceId': generateDeviceId()
+                };
+
+                db.add(emeConfig, DS_CONFIG_ID).then(function success(id) {
+                  resolve(emeConfig);
+                }, function error(e) {
+                  reject('config creation failed');
+                });
+              }
+            }, function error(e) {
+              reject(e.message);
+            });
+
+          } else {
+            reject('invalid datastore setup');
+          }
+        });
+      });
+
+      return promise;
+    }
+  };
+
+  EverythingME.datastore = new emeDataStore();
+})();
diff --git a/apps/homescreen/manifest.webapp b/apps/homescreen/manifest.webapp
index 342035d5007a..52f66728bf4e 100644
--- a/apps/homescreen/manifest.webapp
+++ b/apps/homescreen/manifest.webapp
@@ -56,5 +56,11 @@
   },
   "messages": [
     { "alarm": "/index.html" }
-  ]
+  ],
+  "datastores-owned": {
+    "eme_store": {
+      "access": "readwrite",
+      "description": "Stores Everything.me data"
+    }
+  }
 }
diff --git a/apps/search/js/eme/api.js b/apps/search/js/eme/api.js
index 0e8420715c1e..b6284523b577 100644
--- a/apps/search/js/eme/api.js
+++ b/apps/search/js/eme/api.js
@@ -6,9 +6,13 @@
     var API_URL = 'https://api.everything.me/partners/1.0/{resource}/';
     var API_KEY = '79011a035b40ef3d7baeabc8f85b862f';
 
+    var deviceId = null;
+
     var self = this;
 
     this.init = function init(config) {
+      deviceId = config.deviceId;
+
       addApiMethod('Apps', 'search');
       addApiMethod('Search', 'suggestions');
       addApiMethod('Search', 'bgimage');
@@ -31,14 +35,18 @@
      */
     function apiRequest(resource, options) {
       var url = API_URL.replace('{resource}', resource);
-      var params = 'apiKey=' + API_KEY + '&';
+      var payload = '';
 
-      if (options) {
-        for (var k in options) {
-          var v = options[k];
-          if (v !== null && v !== undefined) {
-            params += k + '=' + encodeURIComponent(options[k]) + '&';
-          }
+      options = options ? options : {};
+
+      // always send apiKey and deviceId
+      options.apiKey = API_KEY;
+      options.deviceId = deviceId;
+
+      for (var k in options) {
+        var v = options[k];
+        if (v !== null && v !== undefined) {
+          payload += k + '=' + encodeURIComponent(options[k]) + '&';
         }
       }
 
@@ -70,7 +78,7 @@
         };
 
         httpRequest.withCredentials = true;
-        httpRequest.send(params);
+        httpRequest.send(payload);
       });
 
       return promise;
diff --git a/apps/search/js/eme/eme.js b/apps/search/js/eme/eme.js
index 123d0f439088..d4a1a9a8f36c 100644
--- a/apps/search/js/eme/eme.js
+++ b/apps/search/js/eme/eme.js
@@ -1,14 +1,60 @@
 (function() {
   'use strict';
 
+  var DS_NAME = 'eme_store';
+  var DS_CONFIG_ID = 1;
+
+  // see duplicate in homescreen/everything.me.js
+  function generateDeviceId() {
+    var url = window.URL.createObjectURL(new Blob());
+    var id = url.replace('blob:', '');
+
+    window.URL.revokeObjectURL(url);
+
+    return 'fxos-' + id;
+  }
+
   window.eme = {
     api: null,
 
+    /**
+     * Get or create config and init search/eme instance.
+     * Config is shared with the homescreen/eme instance via DataStore API.
+     */
     init: function init() {
-      // TODO:
-      // get deviceId from homescreen app
+      var config = new Promise(function done(resolve, reject) {
+        navigator.getDataStores(DS_NAME).then(function(stores) {
+          if (stores.length === 1) {
+            var db = stores[0];
+            db.get(DS_CONFIG_ID).then(function get(emeConfig) {
+              if (emeConfig) {
+                // use existing config
+                resolve(emeConfig);
+              } else {
+                // store new config
+                emeConfig = {
+                  'deviceId': generateDeviceId()
+                };
+                db.add(emeConfig, DS_CONFIG_ID).then(function success(id) {
+                  resolve(emeConfig);
+                }, function error(e) {
+                  reject('config creation failed');
+                });
+              }
+            }, function error(e) {
+              reject(e.message);
+            });
+          } else {
+            reject('invalid datastore setup');
+          }
+        });
+      });
 
-      eme.api.init();
+      config.then(function resolve(emeConfig) {
+        eme.api.init(emeConfig);
+      }, function reject(reason) {
+        // no eme.api
+      });
 
       this.init = function noop() {
         // avoid multiple init calls
diff --git a/apps/search/manifest.webapp b/apps/search/manifest.webapp
index 2e323ea6b9ab..aa6789c722bf 100644
--- a/apps/search/manifest.webapp
+++ b/apps/search/manifest.webapp
@@ -32,5 +32,11 @@
         "manifestURLs": ["app://system.gaiamobile.org/manifest.webapp"]
       }
     }
+  },
+  "datastores-access": {
+    "eme_store": {
+      "readonly": false,
+      "description": "Stores Everything.me data"
+    }
   }
 }