PavelMove

No bug here. It's not a problem of saving cookies. All cookies are managed well, when you using headless mode. No any "fix" can be provided by the project. The...

Looks like you don't need 500ms delay. Just one tick would be enough. It heppens when ajaxForm plugin already loaded at first call of checkAjaxFormLoaded, so createProgress isn't setup properly.

@Menelion any progress? Or it would be better to someone not to wait and start another translation?

It depends on site. So, for 'any' the answer would be 'yes'. But, there are plenty of sites, that doesn't require ip rotation.

Post params should be passed as 1 dimensional array, or an url-encoded string. You can use http_build_query($postArray) to convert multi-dimensional array into proper url-encoded string.

Nor rolling-curl, neither curl it self executes javascript. They are return the raw source of the page. You should use external javascript engine with this library, if you want to...

Use $request->getResponseErrno();