Update
I've created a Patreon page at https://www.patreon.com/amaitland
All details are outlined there, work is underway!
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See cefsharp/CefSharp#1203 for the bug tracking this issue
Current implementation relies on process-per-tab command line flag to limit the number of browser process per ChromiumWebBrowser instance to one, this worked well up until version 58 where the flag no longer works. Chromium will likely re-add support, there is no timeframe on the open tickets as yet, see https://bugs.chromium.org/p/chromium/issues/detail?id=719961 and https://bugs.chromium.org/p/chromium/issues/detail?id=717459
A handler in the main process for notification of sub-process creation and termination, and to receive IPC messages originating from the sub-process.
CEF will likely add a handler that can be used for resolving this issue and maintain the exact same functionality as exists today without having to use process-per-tab command line see https://bitbucket.org/chromiumembedded/cef/issues/2279/expose-custom-sub-process-handlers
As both options have no set timeframe we can rewrite our currently implementation to work slightly differently, bound objects will need to be registered slightly later, so won't be avaliable immediatly after the V8Context has been created. To get around this an event can be added to notify subscribers (in javascript) when object binding has been finished.
Not sure why the patreon page got removed, certainly unfortunate. I don't know if $1000 per release would have sustained CEFSharp on the every other release schedule, but if so there certainly seemed like more than enough interest to hit that target (even given minimal advertising) given it was already at ~$800 if I remember correctly. Is there another platform that would work for recurring? Is there a way to bring the project into compliance with whatever issue they had?