As I mentioned in the bug report the browser starts with a clean user profile.
Another thing when it manages to start is that the browser menu (the one you get on the three vertical dots) appears to have a broken layout
FWIW I had an update for F30 after release to 1.3.4 lined up sometime ago but decided against it because the abicheck didn't look good. Changing libs midrelease somewhat betrays the promise of stable. Regardless of what in Fedora uses it, we have to care about the outside users as well, /me thinks
Thanks for testing and reporting these issues.
Would you please open a new bug for this particular breakage. I've thrown a cursory look at the xml and its just two <para>'s in a table entry so if its broken its probably a bug in the dockbook5 xslt .... But I am short on xml/xslt knowledge so any help would be welcome.