It does exactly what it says on the tin, boosts volume for your tabs. Issue is that the volume boost doesn't stay on if you switch tabs, or if a tab loads a new video. You just have to flip the volume a little bit to turn the boost back on. STill quite useful

Great add-on, I can finally adjust volumes for individual tabs of the browser. It would be cool if you could add additional features similar to the Volume Master extension in the Chrome Web Store.

Muy Bueno

This extension is awesome, but I wish you could input a desired percentage (e.g. 3%, 12%, 86%) value or move the slider by single digit increments rather than 10s (e.g. 0%, 10%, 20% etc.)

i cud ve gave it 5S but bc that everytime the same page reload the volume turns off and i hyave to re adjust it , im not lazy it s just waste of time , im giving it a 4 , but overall the ability to adjust volume to ur fixed pc volume is just incredibly useful.

Nice, simple app to increase volume.
Does the job.

Good volume control but could be improved. I would like to see a button to set the control to the last used setting eg. 400%.

I have the same issue as the reviewer a day as this reviewer: https://addons.mozilla.org/en-GB/firefox/addon/600-sound-volume/reviews/2100655/?utm_content=search&utm_medium=referral&utm_source=addons.mozilla.org

This extension prevents me from clipping on twitch for whatever reason. It works great otherwise but this would need to get fixed please!

I am very grateful for the free use of this great add-on. I have some revisions that you may like.
1) ACTIVATION of ADD-ON, CTRL+3, should ALSO work in FULLSCREEN.
2) When opening new TABS, option = A) open TAB with AUDIO reset to normal. B) open TAB with the "600% Sound Volume" add-on setting, that was previously used.
---> Presently, option "A" is default and is not optional. (Having an Option "B" would be my choice since I run the "600% Sound Volume" add-on, at 300% for every TAB, to match the output levels of my computer, with the input levels required by my external sound system)
---> EDIT: It's 8 months since I made these suggestions, to my knowledge, there is no evidence that they even read my suggestions, let alone implement them. Those changes are simple, I think I'll see if someone else has that feature.

Does as it says as of now

It works! sometimes you need to re-adjust when you change tabs or refreshing the website.

I wish this worked for Soundcloud too...