Broken as well since Firefox 50.0 / Waterfox V 50 / Cyberfox V 50.0 Rated 3 out of 5 stars

Exactly the same bug report than the details given by Bob Smith a few reviews down

This user has a previous review of this add-on.

Works Anywhere Rated 5 out of 5 stars

It has worked almost everywhere for me, and it stops both flash and html5 videos from autoplaying. Along with an adblocker, essential these days.

This user has a previous review of this add-on.

Doesn't work on San Francisco Chronicle Rated 5 out of 5 stars

http://www.sfgate.com/news/science/article/Officials-More-than-40-percent-of-California-out-10852763.php

Great add-on but a few sites are starting beginning to not work anymore.

bug report Rated 5 out of 5 stars

It mostly works but fails on some sites.
i do not see anywhere else for a bug report.
Example: http://www.express.co.uk/news/world/743754/Christmas-fury-school-bans-Fairest-Lord-Jesus-reaching-Christian-values

This user has a previous review of this add-on.

Rated 5 out of 5 stars

it's can't work in http://news.qq.com/a/20161123/019878.htm

Broken in FF 50.0. Rated 1 out of 5 stars

(Perfect replacement: "Disable HTML5 Autoplay"
You'll need to run it in parallel with some other Flash manager if your system is not HTML5-only.)

Blocking is OK with FC and Mozilla 50.0.x, but...

Click the orange V shield and "An error occurred. Please try again later."

To see the YouTube vid, one must select disable from the toolbar button.

Tweaking settings in Config or adding exception to youtube.com - no fix.

Also no e10s/Electrolysis/multiprocess support tho setting browser.tabs.remote.autostart to false is no fix.

No updates since February 2016.

No activity in blueskyy's mozilla-community discourse since May.

One must assume this add-on support/development is abandoned.

This user has 2 previous reviews of this add-on.

Rated 5 out of 5 stars

Great

Rated 5 out of 5 stars

Great app. Blocks autoplay for news sites like CNN and USA Today.

Works well Rated 5 out of 5 stars

Only what i wont to say is work well on my Firefox,thanks a lot !

Multi Process? Rated 3 out of 5 stars

any chance to see this extension ported to multiprocess in a near future?

Cant rate it higher at the moment because the difference between multiprocess and single process firefox is huge in my case.

Works well on average Rated 3 out of 5 stars

On global destinations (Facebook, youtube) works like charm. However, it fails on local sites. It is not able to cover all the code cases there are in the world. And i am in the wrong part of it.

It stops auto play but doesn't stop video buffering Rated 3 out of 5 stars

It stops autoplay on youtube but the video still buffer in the background... imagin openin 20+ youtube links with all buffering in the background at the same time. 3/5 Can't give more because of the buffering.

does not honor the whitelist Rated 3 out of 5 stars

Although Flash Control does seem to block flash it does not honor the whitelist so I always have to click 2 icons (a V and an F) to get the site to work. Not sure why 2 icons. I am currently using v2.1.4. It used to work well. Hope they fix it soon.

Update Problems Rated 5 out of 5 stars

After the February 14th Update flash blocker stopped working. I'm sure this is a temporary issue. An excellent tool to have otherwise.

Downgrading to 2.0.7 Rated 4 out of 5 stars

After installing 2.1.3 Flash Control didn't block videos any more.
I found the older version. I downgraded to 2.0.7, this solved my problem. Now it works again in my FF 43!
Useful add-on.

This review is for a previous version of the add-on (2.1.3).  This user has a previous review of this add-on.

Version 2.1.1 & Abover not working Rated 5 out of 5 stars

2.0.7 was the last working (tested with every up to 2.1.3)
However i tested with a new created profile and seems working fine.
It seem conflicting with some other Perhaps a other Addon?

This review is for a previous version of the add-on (2.1.3). 

Does not work with Firefox 24.9 Rated 5 out of 5 stars

Does not work with Firefox 24.9. Correct it, please. Thank you.

This review is for a previous version of the add-on (2.0.7). 

Work fine Rated 4 out of 5 stars

Work fine but in site vbox7 not work corectly. Sound play, image blocks forever.

This review is for a previous version of the add-on (2.0.7). 

YouTube show comments Rated 5 out of 5 stars

Yeah when on YouTube clicking show comments "View all X number of replies" scrolls me up to the top of the page,
really really really annoying!
how do i fix it?

This review is for a previous version of the add-on (2.0.7). 

This does not seem to behave with AdGuard Rated 1 out of 5 stars

AdGuard is AWESOME for blocking ads, but for some reason when I install this all of a sudden a bunch of HUGE Vs and HUGE As appear on every page. I suspect this add-on is seeing whatever AdGuard is "injecting" to block Ads as something to block. This then puts some sort of "placeholder" which is UGLY. AdGuard cannot go, so this must go but please look into this and fix it along with other problems people report. :P

This review is for a previous version of the add-on (2.0.6).