Created attachment 8659486 [details] Expected, normal view User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:40.0) Gecko/20100101 Firefox/40.0 Build ID: 20150826023504 Steps to reproduce: I haven't been able to find a concise test case other than just keeping developer tools open (possibly having it open in several tabs is a contributing factor?) open for a substantial period of time while making updates, reloading the page, normal developer use. I frequently (and across multiple computers and Firefox versions, have seen this for more than a year and still see it in FF40) have the DOM (tree) view of the inspector disappear. I still see the breadcrumbs view. Things which do not bring back the DOM view: * Switching tools in the developer tools * Moving around elements in the breadcrumbs header * Right-click (ctrl-click) on element in page and choose "Inspect Element" * Using the element picker tool to choose an element to inspect Note: all of these work fine, they just don't restore the missing view. What does seem to work at least most of the time (I think I remember this not working in older versions, but haven't experienced it lately): * Close developer tools, re-open. Actual results: DOM view vanishes, stubbornly won't come back (see screenshots). Expected results: I should keep being about to work with the DOM view even if I keep Developer Tools open for a long time.
Component: Developer Tools → Developer Tools: Inspector
Product: Developer Documentation → Firefox
Bug triage (filter on CLIMBING SHOES). Triaging as a P3 because there doesn't seem to be simple steps to reproduce. I haven't seen bugs about the markup-view being empty in a long time. The only one that comes to mind is bug 1027055 which is related to built-in error pages. Whenever one of those pages is encountered, the markup-view hits an error and gets empty.
Priority: -- → P3
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