Print to PDF: default print filename should come from page title

[wesinator]

User Problem

The print PDF filename is always "Firefox.pdf" when printing.

In Safari, it uses the page title as filename on save/print (converting non-valid filename characters)
Generating the PDF print with the page title as the default filename is good because it differentiates the exported/printed page documents and removes an extra step from the person printing to a file.

To reproduce:

• on a page such as a news artile
• Hit print button on the page, or Menu: Share -> Print then the export button at the top right to generate PDF of print.

I realise this may be limitation in the Safari webkit API. (I couldn't find relevant code)

Ideas for Solution

┆Issue is synchronized with this Jira Task