I know this might be hard to implement fast, I love buildfocus however will not change to Chrome because my computer cant handle it when I open too many working tabs. Could build focus be a web based app so you could use it on any browser?
Sadly it can't just be a normal web page Michael; it has to be able to monitor the other pages you have open, and normal websites aren't allowed to do that.
Keep an eye out though, I'm hopeful that moving to other platforms isn't going to be enormously difficult, so this shouldn't be too far down the pipeline.
Incoming smug report:
What about a website that contains the majority of the functionality and content, such as houses etc. perhaps even stored online so your cities can be accessed across browsers and PCs etc. and then write page data and other things only extensions can access to the page's Local Storage, so you only need to implement and maintain the tab code in browser extensions, and people could try the app without installing an extension for their browser, or contribute to their cities with browsers that never will support the extension(my phone is very old...)
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