Embedded twitter The media could not be played Fix

User Help for Mozilla Firefox
Frank Lion

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Posts: 20842
Joined: April 23rd, 2004, 6:59 pm
Location: ... The Exorcist....United Kingdom

Post Posted December 25th, 2017, 3:56 pm

c627627 wrote:Thank you.
And especially thank you for posting a solution

No problem.

One picture is worth a 1,000 words, etc. Don't bother thanking our in-house AI unit, it won't understand it.
Metal Lion latest SeaMonkey & Thunderbird Themes - Sea Monkey and Silver Sea Monkey
"The only thing necessary for the triumph of evil, is for good men to do nothing." - Edmund Burke (attrib.)


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Posts: 627
Joined: April 3rd, 2005, 12:58 pm
Location: Kansas City, Missouri

Post Posted December 27th, 2017, 10:42 am

Not sure if you'll answer but Frank, would you mind if I asked about your claim to fame?
Are you a Firefox developer... associated with Mozilla itself, or maybe this forum? I know people know you here, but for us outsiders...

Twitter videos are not playing in the about to be made public Firefox ESR 52.5.3 and by extension I assume also Fx 57.0.3.
So it looks like the earliest this gets addressed is Fx58.
Or maybe we'll get confirmation this is all by design and will never be addressed, I would welcome that news because I would just redo all Firefox images on family's computers with Gingerbread Man's fix, just don't want to go through with the effort if it'll get addressed in Fx58, but on the other hand, Fx58 is almost a full month away, Jan 23, 2018...
Open the pod bay doors, Cortana.

Luna C

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Posts: 36
Joined: June 9th, 2007, 11:36 am

Post Posted December 27th, 2017, 3:55 pm

I have no idea what I'm doing wrong with the header editor, it's still not working. :/

I exported the rule and this is what it shows, where am I going wrong?
Code: Select all
   "request": [],
   "sendHeader": [
         "enable": 1,
         "name": "Twitter",
         "ruleType": "modifySendHeader",
         "matchType": "prefix",
         "pattern": "",
         "exclude": "",
         "isFunction": false,
         "action": {
            "name": "content-security-policy",
            "value": ""
         "id": 2
   "receiveHeader": []

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