Can you play Amazon Prime videos in Developer Edition?

I am having this same problem. It's not my internet connection: I can play videos on other streamers like Hulu. My wife can play Amazon videos and we share the internet connection. AMazon Help has not helped: they suggested I try running them on Chrome, which does work.

I am still having the same problem. Can play amazon movies on other browsers and I was able to play movies on Monday but nor since then. I have not found an answer from firefox (mozilla) or amazon. I doubt it's a problem from amazon since I can play their movies on Chrome and safari. I'm guessing that firefox(mozilla) just doesn't care or else there is some bad blood between Firefox and amazon. In any case that renders Firefox useless for me. What a shame.

Are you able to play trailers?

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

• Settings -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Settings -> Privacy & Security
  Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

• https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
• https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

To zeroknight, No I can not play trailers via the trailer control button [I get the same black screen as with trying to play the movie and with the same message: Video Unavailable We're experiencing a problem playing this video. For assistance, please go to www.amazon.com/videohelp and with the same inability to find a help suggestion that works] but I do see the trailer that appears when you bring up the movie's Play/Resume/Play Again screen.

To cor-el, the reload options do nothing to change the problem. I haven't got to the many other suggestions you offered as yet [just got the email response]. Will try some of the others tomorrow. Seems a lot of different things to try to fix a problem that shouldn't have arisen. I'm not a developer, just an old guy using my iMac with Firefox that has worked well for years.

I'm getting frustrated trying to make this work again. I'd rather have a working Firefox than Chrome or Safari. Oh well, maybe the next update will make it work for movies from Amazon.

Saw this on Reddit which mentions Adblocker Ultimate extension causing issues.

I don't have Amazon Prime so can't really test playing videos there.

Well, I did find that they do have an area to play videos with ads and that seemed to work. I'm running 118.0.2 in Windows 10 Pro.

Did you try the last part of my above reply about: Starting Firefox in Troubleshoot Mode ?

cor-el, I have not gotten to the last part as yet [I have been busy with medical problems]. However I had an answer suggested by MarkRH which suggested it my be my Adblocker. I disabled Adblocker for the Amazon Prime Video site and I can now play both movies and previews.

Thanks for your efforts in supplying your suggestions. I may very well explore those suggestions out of curiosity, but I will need to wait until after surgery.

Such a dumb glitch. But it seems fixed. I guess Amazon needs more money.

In any case I'm pleased that I can still do all my browsing on Firefox as I really don't care for Chrome or Safari.

Again thanks for your replies.

Jim Hake