I know they somewhat recently added a mute button to tabs but I wasn't sure if there was a way to lower the volume of a specific tab or website. I have to have it at nearly 100% volume in Window's volume mixer for music playing sites like Youtube, but then for example when I practice languages on Memrise or Duolingo, I don't want it blaring.

Can I turn off sound for a website but not the computer? Sick of advertisements blaring sound when you open a new web page? We all have ever encountered situations where audio suddenly starts to play in your web browser, and this could be really annoying. In this tutorial we’ll show you how to turn off sound in Chrome, Firefox and Edge on Windows 10.

Part 1: Disable Sound in Chrome

• However, in either FF or IE the audio volume is stuck at barely audible, even though I have the volume wheel set at maximum. I am in a Windows XP environment, using FF 16.0.1. The speakers on my laptop work fine, outside of any browser.
• Missing Volume Control Online running Firefox on Windows 7 I have had a problem for the past 6 months with regards to raising or lowering the volume whilst running Firefox on Windows 7 on my laptop. I noticed last year than when I was watching videos on Youtube, pressing F8 or F9 to adjust the control didn't work.at all.
• Firefox will not prompt for access to your microphone or camera if you’ve already granted access to the same device on the same site in the same tab within the past 50 seconds. This new grace period reduces the number of times you’re prompted to grant device access.

When a Chrome tab is playing sound, you will see a little speaker icon on that tab. Right-click on it, and select the “Mute Tab” option from the pop-up menu.

Part 2: Disable Sound in Firefox

Firefox Sound Volume Control

When a web page in Firefox starts to play audio, you can click the speaker icon to toggle the sound for that one tab off, and click it again to toggle the sound back on.

Firefox Volume Control Per Tab

Part 3: Disable Sound in Microsoft Edge

Just like other browsers, Microsoft Edge also uses a speaker icon to indicate which tab is playing sound. However, Edge doesn’t yet provide an option to mute tabs. Luckily, there is an open-source program called EarTrumpet that makes it easier to adjust the volume of specific apps in Windows 10.

Here’s how to use EarTrumpet to turn off sound and prevent all web pages from playing audio in Microsoft Edge:

Just open the Windows Store app and search for EarTrumpet, and then click the Get button to download and install it on your local PC.

No Sound In Firefox

After installing, you’ll see a small trumpet icon in the notification area of Windows 10, near the bottom-right corner of your screen. Click on this icon and you can view and control the volume levels of different apps that are running in Windows 10.

You can turn off sounds for Microsoft Edge by moving the slider to the far left. That’s it!

For the volume, unlike Chromium for example, firefox synchronizes it's pulse stream with the volume level of whatever source you have opened (and if that source stores it's volume levels, it will be applied accordingly) e.g. if you open up youtube or most other streaming pages, the volume in that specific player will be remembered across sessions in your account, and that's what firefox replicates over to the pulse stream.

To properly assess whether that's the case here you might want to point out on which specific pages you are seeing this 'default volume'. I'm not sure whether it's possible to prevent Firefox from this synchronization so that the volumes would be distinct again, but I haven't looked into it much either.

No, I've looked into it. It's a known bug.

https://bugzilla.mozilla.org/show_bug.cgi?id=1454185
https://bugzilla.mozilla.org/show_bug.cgi?id=1343681
https://bugzilla.mozilla.org/show_bug.cgi?id=1422637
https://bugzilla.mozilla.org/show_bug.cgi?id=1407288
https://bugzilla.mozilla.org/show_bug.cgi?id=1515549

It's unbelievable one can't set a volume level for a specified application, unless you adjust it over and over because it can't remember the level you set. And the application here is Firefox. Quite annoying.