diff --git a/browser/base/content/test/plugins/browser.ini b/browser/base/content/test/plugins/browser.ini
index 181c1dad6195..03abd87fa96a 100644
--- a/browser/base/content/test/plugins/browser.ini
+++ b/browser/base/content/test/plugins/browser.ini
@@ -22,11 +22,13 @@ support-files =
plugin_clickToPlayAllow.html
plugin_clickToPlayDeny.html
plugin_data_url.html
+ plugin_favorfallback.html
plugin_hidden_to_visible.html
plugin_iframe.html
plugin_outsideScrollArea.html
plugin_overlayed.html
plugin_positioned.html
+ plugin_simple_blank.swf
plugin_small.html
plugin_small_2.html
plugin_syncRemoved.html
@@ -59,6 +61,7 @@ tags = blocklist
tags = blocklist
[browser_CTP_drag_drop.js]
tags = blocklist
+[browser_CTP_favorfallback.js]
[browser_CTP_hide_overlay.js]
tags = blocklist
[browser_CTP_iframe.js]
diff --git a/browser/base/content/test/plugins/browser_CTP_favorfallback.js b/browser/base/content/test/plugins/browser_CTP_favorfallback.js
new file mode 100644
index 000000000000..7ed6fed49df5
--- /dev/null
+++ b/browser/base/content/test/plugins/browser_CTP_favorfallback.js
@@ -0,0 +1,84 @@
+var rootDir = getRootDirectory(gTestPath);
+const gTestRoot = rootDir.replace("chrome://mochitests/content/", "http://127.0.0.1:8888/");
+var gPluginHost = Components.classes["@mozilla.org/plugin/host;1"].getService(Components.interfaces.nsIPluginHost);
+
+add_task(async function() {
+ registerCleanupFunction(function() {
+ clearAllPluginPermissions();
+ setTestPluginEnabledState(Ci.nsIPluginTag.STATE_ENABLED, "Shockwave Flash");
+ Services.prefs.clearUserPref("plugins.favorfallback.mode");
+ Services.prefs.clearUserPref("plugins.favorfallback.rules");
+ });
+});
+
+add_task(async function() {
+ Services.prefs.setCharPref("plugins.favorfallback.mode", "follow-ctp");
+ setTestPluginEnabledState(Ci.nsIPluginTag.STATE_CLICKTOPLAY, "Shockwave Flash");
+});
+
+/* The expected behavior of each testcase is documented with its markup
+ * in plugin_favorfallback.html.
+ *
+ * - "name" is the name of the testcase in the test file.
+ * - "rule" is how the plugins.favorfallback.rules must be configured
+ * for this testcase.
+ */
+const testcases = [
+ {
+ name: "video",
+ rule: "video",
+ },
+
+ {
+ name: "nosrc",
+ rule: "nosrc",
+ },
+
+ {
+ name: "embed",
+ rule: "embed,true",
+ },
+
+ {
+ name: "adobelink",
+ rule: "adobelink,true",
+ },
+
+ {
+ name: "installinstructions",
+ rule: "installinstructions,true",
+ },
+
+];
+
+add_task(async function() {
+ for (let testcase of Object.values(testcases)) {
+ info(`Running testcase ${testcase.name}`);
+
+ Services.prefs.setCharPref("plugins.favorfallback.rules", testcase.rule);
+
+ let tab = await BrowserTestUtils.openNewForegroundTab(
+ gBrowser,
+ `${gTestRoot}plugin_favorfallback.html?testcase=${testcase.name}`
+ );
+
+ await ContentTask.spawn(tab.linkedBrowser, testcase.name, async function testPlugins(name) {
+ let testcaseDiv = content.document.getElementById(`testcase_${name}`);
+ let ctpPlugins = testcaseDiv.querySelectorAll(".expected_ctp");
+
+ for (let ctpPlugin of ctpPlugins) {
+ ok(ctpPlugin instanceof Ci.nsIObjectLoadingContent, "This is a plugin object");
+ is(ctpPlugin.pluginFallbackType, Ci.nsIObjectLoadingContent.PLUGIN_CLICK_TO_PLAY, "Plugin is CTP");
+ }
+
+ let fallbackPlugins = testcaseDiv.querySelectorAll(".expected_fallback");
+
+ for (let fallbackPlugin of fallbackPlugins) {
+ ok(fallbackPlugin instanceof Ci.nsIObjectLoadingContent, "This is a plugin object");
+ is(fallbackPlugin.pluginFallbackType, Ci.nsIObjectLoadingContent.PLUGIN_ALTERNATE, "Plugin fallback content was used");
+ }
+ });
+
+ await BrowserTestUtils.removeTab(tab);
+ }
+})
diff --git a/browser/base/content/test/plugins/plugin_favorfallback.html b/browser/base/content/test/plugins/plugin_favorfallback.html
new file mode 100644
index 000000000000..6eaf15499446
--- /dev/null
+++ b/browser/base/content/test/plugins/plugin_favorfallback.html
@@ -0,0 +1,96 @@
+
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+
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+
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+
diff --git a/browser/base/content/test/plugins/plugin_simple_blank.swf b/browser/base/content/test/plugins/plugin_simple_blank.swf
new file mode 100644
index 000000000000..b846387eb8b8
Binary files /dev/null and b/browser/base/content/test/plugins/plugin_simple_blank.swf differ