Open Source browser transaction recorder/ replayer

Is there any open source tool/extension, something like resurectio or Selenium IDE or DejaClick, which records transaction in browser and even have possibility to replay transaction in browser, more precisely FF, Chrome? It should have possibility to save transaction in script in some format which will easily see what is going on in transaction and also some easy asserts.

I spend many hours googling but with no effect and I do not believe that this tool/extension does not exists in open source world, so any suggestions are welcome.

Thanks, Peter