A handful of tests were temporarily disabled and moved to the devtools/client/shared/tests directory so that we could remove the old debugger and elevate the new debugger: browser_dbg_promises-allocation-stack.js browser_dbg_promises-chrome-allocation-stack.js browser_dbg_promises-fulfillment-stack.js browser_dbg_promises-rejection-stack.js browser_dbg_terminate-on-tab-close.js Along with assets: doc_promise-get-allocation-stack.html doc_promise-get-fulfillment-stack.html doc_promise-get-rejection-stack.html doc_terminate-on-tab-close.html We should update the code in those tests so that we can reenable them. The utility file they used was: https://hg.mozilla.org/mozilla-central/file/37d240a1d498/devtools/client/debugger/test/mochitest/head.js