diff --git a/extensions/amp-access/0.1/test/test-jwt.js b/extensions/amp-access/0.1/test/test-jwt.js
index f69a40c97c41..e071273abfe5 100644
--- a/extensions/amp-access/0.1/test/test-jwt.js
+++ b/extensions/amp-access/0.1/test/test-jwt.js
@@ -184,7 +184,6 @@ describe('JwtHelper', () => {
 
       windowApi = {
         crypto: {subtle},
-        services: {},
       };
       helper = new JwtHelper(windowApi);
     });
diff --git a/src/3p-frame.js b/src/3p-frame.js
index 7ff95b36d684..5e8132ccb49e 100644
--- a/src/3p-frame.js
+++ b/src/3p-frame.js
@@ -236,7 +236,7 @@ export function setDefaultBootstrapBaseUrlForTesting(url) {
  * @param {*} win
  */
 export function resetBootstrapBaseUrlForTesting(win) {
-  win.defaultBootstrapSubDomain = undefined;
+  win.__AMP_DEFAULT_BOOTSTRAP_SUBDOMAIN = undefined; // eslint-disable-line google-camelcase/google-camelcase
 }
 
 /**
@@ -251,11 +251,12 @@ export function getDefaultBootstrapBaseUrl(parentWindow, opt_srcFileBasename) {
     return getDevelopmentBootstrapBaseUrl(parentWindow, srcFileBasename);
   }
   // Ensure same sub-domain is used despite potentially different file.
-  parentWindow.defaultBootstrapSubDomain =
-    parentWindow.defaultBootstrapSubDomain || getSubDomain(parentWindow);
+  parentWindow.__AMP_DEFAULT_BOOTSTRAP_SUBDOMAIN = // eslint-disable-line google-camelcase/google-camelcase
+    parentWindow.__AMP_DEFAULT_BOOTSTRAP_SUBDOMAIN ||
+    getSubDomain(parentWindow);
   return (
     'https://' +
-    parentWindow.defaultBootstrapSubDomain +
+    parentWindow.__AMP_DEFAULT_BOOTSTRAP_SUBDOMAIN +
     `.${urls.thirdPartyFrameHost}/${internalRuntimeVersion()}/` +
     `${srcFileBasename}.html`
   );
diff --git a/src/experiments.js b/src/experiments.js
index 3a609d4c189a..0dd946fb437f 100644
--- a/src/experiments.js
+++ b/src/experiments.js
@@ -305,7 +305,7 @@ function selectRandomItem(arr) {
  *
  * Check whether a given experiment is set using isExperimentOn(win,
  * experimentName) and, if it is on, look for which branch is selected in
- * win.experimentBranches[experimentName].
+ * win.__AMP_EXPERIMENT_BRANCHES[experimentName].
  *
  * @param {!Window} win Window context on which to save experiment
  *     selection state.
@@ -315,7 +315,7 @@ function selectRandomItem(arr) {
  *     branches.
  */
 export function randomlySelectUnsetExperiments(win, experiments) {
-  win.experimentBranches = win.experimentBranches || {};
+  win.__AMP_EXPERIMENT_BRANCHES = win.__AMP_EXPERIMENT_BRANCHES || {};
   const selectedExperiments = {};
   for (const experimentName in experiments) {
     // Skip experimentName if it is not a key of experiments object or if it
@@ -323,9 +323,9 @@ export function randomlySelectUnsetExperiments(win, experiments) {
     if (!hasOwn(experiments, experimentName)) {
       continue;
     }
-    if (hasOwn(win.experimentBranches, experimentName)) {
+    if (hasOwn(win.__AMP_EXPERIMENT_BRANCHES, experimentName)) {
       selectedExperiments[experimentName] =
-        win.experimentBranches[experimentName];
+        win.__AMP_EXPERIMENT_BRANCHES[experimentName];
       continue;
     }
 
@@ -333,7 +333,7 @@ export function randomlySelectUnsetExperiments(win, experiments) {
       !experiments[experimentName].isTrafficEligible ||
       !experiments[experimentName].isTrafficEligible(win)
     ) {
-      win.experimentBranches[experimentName] = null;
+      win.__AMP_EXPERIMENT_BRANCHES[experimentName] = null;
       continue;
     }
 
@@ -341,13 +341,15 @@ export function randomlySelectUnsetExperiments(win, experiments) {
     // experiment branch (e.g., via a test setup), then randomize the branch
     // choice.
     if (
-      !win.experimentBranches[experimentName] &&
+      !win.__AMP_EXPERIMENT_BRANCHES[experimentName] &&
       isExperimentOn(win, /*OK*/ experimentName)
     ) {
       const {branches} = experiments[experimentName];
-      win.experimentBranches[experimentName] = selectRandomItem(branches);
+      win.__AMP_EXPERIMENT_BRANCHES[experimentName] = selectRandomItem(
+        branches
+      );
       selectedExperiments[experimentName] =
-        win.experimentBranches[experimentName];
+        win.__AMP_EXPERIMENT_BRANCHES[experimentName];
     }
   }
   return selectedExperiments;
@@ -363,7 +365,9 @@ export function randomlySelectUnsetExperiments(win, experiments) {
  *     null if experimentName has been tested but no branch was enabled).
  */
 export function getExperimentBranch(win, experimentName) {
-  return win.experimentBranches ? win.experimentBranches[experimentName] : null;
+  return win.__AMP_EXPERIMENT_BRANCHES
+    ? win.__AMP_EXPERIMENT_BRANCHES[experimentName]
+    : null;
 }
 
 /**
@@ -377,7 +381,7 @@ export function getExperimentBranch(win, experimentName) {
  * @visibleForTesting
  */
 export function forceExperimentBranch(win, experimentName, branchId) {
-  win.experimentBranches = win.experimentBranches || {};
+  win.__AMP_EXPERIMENT_BRANCHES = win.__AMP_EXPERIMENT_BRANCHES || {};
   toggleExperiment(win, experimentName, !!branchId, true);
-  win.experimentBranches[experimentName] = branchId;
+  win.__AMP_EXPERIMENT_BRANCHES[experimentName] = branchId;
 }
diff --git a/src/log.js b/src/log.js
index a3cedcdacd07..d106e7e3c056 100644
--- a/src/log.js
+++ b/src/log.js
@@ -711,13 +711,13 @@ export function rethrowAsync(var_args) {
  * on Log and closure literally can't even.
  * @type {{user: ?Log, dev: ?Log, userForEmbed: ?Log}}
  */
-self.log = self.log || {
+self.__AMP_LOG = self.__AMP_LOG || {
   user: null,
   dev: null,
   userForEmbed: null,
 };
 
-const logs = self.log;
+const logs = self.__AMP_LOG;
 
 /**
  * Eventually holds a constructor for Log objects. Lazily initialized, so we
diff --git a/test/unit/test-experiments.js b/test/unit/test-experiments.js
index e9fab0ff3bf1..ea21231ba438 100644
--- a/test/unit/test-experiments.js
+++ b/test/unit/test-experiments.js
@@ -617,7 +617,7 @@ describe('experiment branch tests', () => {
         isExperimentOn(sandbox.win, 'testExperimentId'),
         'experiment is on'
       ).to.be.false;
-      expect(sandbox.win.experimentBranches).to.be.empty;
+      expect(sandbox.win.__AMP_EXPERIMENT_BRANCHES).to.be.empty;
     });
 
     it('handles experiment not diverted path', () => {