[orca-list] On Firefox, Orca announces 5 "finished loading" at startup whereas I've only one tab

[Alex ARNAUD <aarnaud hypra fr>]

Hello,

Environment:
- Debian 9 "Stretch"
- Orca master
- Firefox Nightly

The web page which is loaded at startup: 
https://www.lifehack.org/articles/productivity/5-wonderful-background-noise-resources-that-will-boost-your-productivity.html

My Firefox extensions are:
- Custom UserAgent String
- Zoom Page WE
- Notification Sound
- Video DownloadHelper

I've produced a debug log you could download there:
https://framabin.org/p/?c74fe3bc829df2e9#63ysMc9jxUXfnCX39roKepX2J5SH6mQjHxRvIz9oFv4=

Best regards,
Alex.