The Tor Browser / file revision

     // For mochitests, we're more interested in testing the behavior of in-

     // content XBL bindings, so we set this pref to true. In reftests, we're

     // more interested in testing the behavior of XBL as it works in chrome,

     // so we want this pref to be false.

     branch.setBoolPref("dom.use_xbl_scopes_for_remote_xul", false);

     branch.setBoolPref("gfx.color_management.force_srgb", true);

     branch.setBoolPref("browser.dom.window.dump.enabled", true);

     branch.setIntPref("ui.caretBlinkTime", -1);

     branch.setBoolPref("dom.send_after_paint_to_content", true);

     // no slow script dialogs

     branch.setIntPref("dom.max_script_run_time", 0);

     branch.setIntPref("dom.max_chrome_script_run_time", 0);

     branch.setIntPref("hangmonitor.timeout", 0);

     // Ensure autoplay is enabled for all platforms.

     branch.setBoolPref("media.autoplay.enabled", true);

     // Disable updates

     branch.setBoolPref("app.update.enabled", false);

     // Disable addon updates and prefetching so we don't leak them

     branch.setBoolPref("extensions.update.enabled", false);

     branch.setBoolPref("extensions.getAddons.cache.enabled", false);

     // Disable blocklist updates so we don't have them reported as leaks

     branch.setBoolPref("extensions.blocklist.enabled", false);

     // Make url-classifier updates so rare that they won't affect tests

     branch.setIntPref("urlclassifier.updateinterval", 172800);

     // Disable high-quality downscaling, since it makes reftests more difficult.

     branch.setBoolPref("image.high_quality_downscaling.enabled", false);

     // Checking whether two files are the same is slow on Windows.

     // Setting this pref makes tests run much faster there.

     branch.setBoolPref("security.fileuri.strict_origin_policy", false);

     // Disable the thumbnailing service

     branch.setBoolPref("browser.pagethumbnails.capturing_disabled", true);

     // Since our tests are 800px wide, set the assume-designed-for width of all

     // pages to be 800px (instead of the default of 980px). This ensures that

     // in our 800px window we don't zoom out by default to try to fit the

     // assumed 980px content.

     branch.setIntPref("browser.viewport.desktopWidth", 800);

     // Disable the fade out (over time) of overlay scrollbars, since we

     // can't guarantee taking both reftest snapshots at the same point

     // during the fade.

     branch.setBoolPref("layout.testing.overlay-scrollbars.always-visible", true);

     // Disable interruptible reflow since (1) it's normally not going to

     // happen, but (2) it might happen if we somehow end up with both

     // pending user events and clock skew.  So to avoid having to change

     // MakeProgress to deal with waiting for interruptible reflows to

     // complete for a rare edge case, we just disable interruptible

     // reflow so that that rare edge case doesn't lead to reftest

     // failures.

     branch.setBoolPref("layout.interruptible-reflow.enabled", false);