We have a handful of markers that developers may be familiar with if they've used Chrome's devtools (recalc style, layout, paint), and additional ones that are either Firefox specific (Cycle Collection) or something Chrome tools does not have (Parse HTML?). We should have a tooltip in the marker details view (probably a [?] maybe?) that gives a 1-2 sentence description of what this marker represents. Optionally a link to MDN with more information.

I don't think there is value in duplicating what the MDN docs should already say in a better fashion. We should just ensure that each marker type has its own anchor, and link there. Additionally, we could pop open a Tooltip view with the MDN page instead of opening it in a new tab.

It's not duplicating -- one is a tooltip for a brief description, no different than tooltips describing the columns in call tree views, whereas the docs[0] can go into further detail. If we want the tooltips to be like inspector's MDN Tooltips, that should be moderately straight forward, and OK as well if we want to display more than just "tooltip" info. Also wondering if the MDN Tooltip can cache -- it uses nsIXMLHttpRequest now, which may handle caching on its own, but something to consider in offline modes. [0] https://developer.mozilla.org/en-US/docs/Tools/Performance/Waterfall#Markers

Triaging. Filter on ADRENOCORTICOTROPIC (yes).