Bug 1776056 - disable browser_omta_tearoff_tab.js on linux for frequent failures. r=#intermittent-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D166258

gfx/tests/browser/browser.ini

@@ -6,6 +6,8 @@ support-files =
   file_native_font_cache_macos.html
 skip-if = (os != 'mac')
 [browser_omta_tearoff_tab.js]
+skip-if =
+  os == "linux" # Bug 1776056
 [browser_partial_prerender_animation_in_popup.js]
 support-files =
   !/dom/animation/test/testcommon.js