Bug 1357486: Part 0f - Run some chrome tests in in-process mode. r=aswan

MozReview-Commit-ID: 1T0tEpwTU3c

--HG--
extra : rebase_source : f49082b932105695dd496e53e7bad52fb807e42b
extra : absorb_source : 7b06902d6d952c355cc27744789f43f34ef27980
extra : histedit_source : dfc9abfb4a8a66f5789f7773e649ffbd973b0465

toolkit/components/extensions/test/mochitest/test_chrome_ext_downloads_open.html

@@ -56,6 +56,10 @@ add_task(async function test_downloads_open_requires_user_interaction() {
 });
 
 add_task(async function downloads_open_invalid_id() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["extensions.webextensions.remote", false]],
+  });
+
   async function pageScript() {
     window.addEventListener("keypress", async function handler() {
       try {

toolkit/components/extensions/test/mochitest/test_chrome_ext_permissions.html

@@ -157,7 +157,8 @@ function makeTest(manifestPermissions, optionalPermissions, checkFetch = true) {
 add_task(function setup() {
   // Don't bother with prompts in this test.
   return SpecialPowers.pushPrefEnv({
-    set: [["extensions.webextOptionalPermissionPrompts", false]],
+    set: [["extensions.webextensions.remote", false],
+          ["extensions.webextOptionalPermissionPrompts", false]],
   });
 });