[Akeras]

Thanks again for your reply!
I did explore the QWebEnginePage idea but when I want to import it

from PyQt5.QtWebEngineWidgets import  QWebEnginePage

I get:
calibre, version 4.8.0
ERROR: Invalid recipe: Failed to compile the recipe, with syntax error: QtWebEngineWidgets must be imported before a QCoreApplication instance is created

So I tried so trick found on internet which is to call first

from PyQt5.QtWidgets import QApplication
app = QApplication.instance()
if app is not None:
    import sip
    app.quit()
    sip.delete(app)

but app.quit() is actually killing Calibre....

Any thoughts?

Thanks a lot!