Bug 1347329 - After splitting browser_selectpopup.js up, disable it on Linux per bug 1329991. r=mossop

MozReview-Commit-ID: 7ibIywvYsBn

--HG--
extra : rebase_source : 57f8a0def3e7520520410b566c5ff180f1180491

browser/base/content/test/forms/browser.ini

@@ -5,3 +5,4 @@ support-files =
 [browser_selectpopup.js]
 skip-if = os == "linux" # Bug 1329991 - test fails intermittently on Linux builds
 [browser_selectpopup_colors.js]
+skip-if = os == "linux" # Bug 1329991 - test fails intermittently on Linux builds

browser/base/content/test/forms/browser_selectpopup_colors.js

@@ -156,6 +156,15 @@ function* testSelectColors(select, itemCount, options) {
   yield BrowserTestUtils.removeTab(tab);
 }
 
+add_task(function* setup() {
+  yield SpecialPowers.pushPrefEnv({
+    "set": [
+      ["dom.select_popup_in_parent.enabled", true],
+      ["dom.forms.select.customstyling", true]
+    ]
+  });
+});
+
 // This test checks when a <select> element has styles applied to <option>s within it.
 add_task(function* test_colors_applied_to_popup_items() {
   yield testSelectColors(PAGECONTENT_COLORS, 7,