--- a/toolkit/components/telemetry/TelemetryEnvironment.jsm
+++ b/toolkit/components/telemetry/TelemetryEnvironment.jsm
@@ -181,17 +181,17 @@ const DEFAULT_ENVIRONMENT_PREFS = new Ma
   ["browser.tabs.animate", {what: RECORD_PREF_VALUE}],
   ["browser.urlbar.suggest.searches", {what: RECORD_PREF_VALUE}],
   ["browser.urlbar.userMadeSearchSuggestionsChoice", {what: RECORD_PREF_VALUE}],
   ["devtools.chrome.enabled", {what: RECORD_PREF_VALUE}],
   ["devtools.debugger.enabled", {what: RECORD_PREF_VALUE}],
   ["devtools.debugger.remote-enabled", {what: RECORD_PREF_VALUE}],
   ["dom.ipc.plugins.asyncInit.enabled", {what: RECORD_PREF_VALUE}],
   ["dom.ipc.plugins.enabled", {what: RECORD_PREF_VALUE}],
-  ["dom.ipc.processCount", {what: RECORD_PREF_VALUE, requiresRestart: true}],
+  ["dom.ipc.processCount", {what: RECORD_PREF_VALUE}],
   ["dom.max_script_run_time", {what: RECORD_PREF_VALUE}],
   ["experiments.manifest.uri", {what: RECORD_PREF_VALUE}],
   ["extensions.autoDisableScopes", {what: RECORD_PREF_VALUE}],
   ["extensions.enabledScopes", {what: RECORD_PREF_VALUE}],
   ["extensions.blocklist.enabled", {what: RECORD_PREF_VALUE}],
   ["extensions.blocklist.url", {what: RECORD_PREF_VALUE}],
   ["extensions.strictCompatibility", {what: RECORD_PREF_VALUE}],
   ["extensions.update.enabled", {what: RECORD_PREF_VALUE}],
@@ -1232,16 +1232,17 @@ EnvironmentCache.prototype = {
     let updateChannel = null;
     try {
       updateChannel = UpdateUtils.getUpdateChannel(false);
     } catch (e) {}
 
     this._currentEnvironment.settings = {
       blocklistEnabled: Preferences.get(PREF_BLOCKLIST_ENABLED, true),
       e10sEnabled: Services.appinfo.browserTabsRemoteAutostart,
+      e10sMultiProcesses: Services.appinfo.maxWebProcessCount,
       e10sCohort: Preferences.get(PREF_E10S_COHORT, "unknown"),
       telemetryEnabled: Utils.isTelemetryEnabled,
       locale: getBrowserLocale(),
       update: {
         channel: updateChannel,
         enabled: Preferences.get(PREF_UPDATE_ENABLED, true),
         autoDownload: Preferences.get(PREF_UPDATE_AUTODOWNLOAD, true),
       },