Okay. To answer the last post by barbaz:
* 1. My current browser installation is:
=> Firefox-50.1.0 (Linux-x86_64) (Latest Release - (Security Fixes)).
=> NoScript-2.9.5.2 (Latest Release).
=> Flashplayer-11.2.202.644 (as a plugin) (Latest Upstream Release).
=> e10s: "Enabled by default" out of the box - which is one the many usual sick jokes from Mozilla, given that the "about:config" setting for responsible for this in my installation as it came out of the box is:
"browser.tabs.remote.autostart.2"; user set; boolean; "true"
Well, this user never set the above boolean to "true", i.e, I was never asked to opt-in....forgive my gripe, but I'm getting more than rather sick of Mozilla's configuration interface for Firefox & Thunderbird being such a mess, and so insidious and deceitful. Anyhow to continue...
* 2. I did as barbaz suggested in the previous post, I shutdown e10s by changing the above boolean to "false", and confirmed this by re-launching Firefox, and visiting "about:support".
* 3. As a result; Firefox launched a lot faster; ABC-iView allowed me to play a flash video (as they all are at ABC-iView) - in this case I tested it on "Joanna Lumley's Japan", episode 2, and the programme played successfully.
* 4. Success too at SBS-OnDemand. Just a note for my fellow denizens within Australia's borders; SBS-OnDemand is now a right pain in my opinion, due to the totalitarian requirement for us to login to access the programmes, which now means that I have to allow a large list of scripts and objects!!
* 5. Summary so far:
5.1. The two sites mentioned above, fail with my configuration set as outlined in point "1" above.
5.2. Success if I completely remove NoScript-2.9.5.2 (& 2.9.5.1).
5.3. Success if I rollback to NoSript-2.9.0.14.
5.4. Success with my configuration set as outlined in point "1" above (beginning of this post), if used at some other flash based sites such as; NHK World
https://www3.nhk.or.jp/nhkworld/ and Deutsche Welle
http://www.dw.com/en/