The speaker icon would be handy but I think that it depends from both the good will of Firefox and the installed add ons. Of course if an add on blocks the audio file there is no need to display the speaker icon for that file.

To give you the idea of what is going on, this is what uMatrix shows about www.aliexpress.com in my Firefox browser on my laptop. It would be more difficult to copy and paste from uMatrix on my Android phone. It shows a number of sites. Nothing in first party and these that I must fully enable to make the site work (css, image, script, xhr)

* aliexpress.com

* ase.aliexpress.com

* it.aliexpress.com (my country two letters domain)

* umdc-global.aliexpress.com

* aidcgroup.net

* ase.aidcgroup.net

* 67372.ase.aidcgroup.net

* alibaba-inc.com

* epss.alibaba-inc.com

* alicdn.com

* ae01.alicdn.com

* assets.alicdn.com

* aliexpress-media.com

* ae-pic-a1.aliexpress-media.com

* assets.aliexpress-media.com

* aliyun.com

* acjs.aliyun.com

Scary list, right? According to google aidcroup is

> Alibaba International IPP Platform

> https://ipp.aidcgroup.net

> Alibaba International is committed to the protection of intellectual property rights. Right holders and their agents can enforce intellectual property ...

Let me add a /s to the last line

There are two more sites that I can completely block

* googlesyndication.com

* pagead2.googlesyndication.com

so even Alibaba runs ads on Google.

I did not instrument the browser like the author of the post did, so I don't know where the audio comes from. There is nothing listed in the media column of uMatrix. This does not mean that the post is inaccurate. It could be that the browser gets the audio stream from a request in one of the other categories.

uBlockOrigin blocks two of other requests.

1. https://g.alicdn.com/code/npm/@ali/gmod-pop-disclosure-code/...

and this one that I anonymize

2. https://aplus.aliexpress.com/g.gif?logtype=0&title=WebPush Permission&pre=https://it.aliexpress.com/?gatewayAdapt=glo2ita&scr=1920x1080&_p_url=https://it.aliexpress.com/wp.html&cna=<whatever cna is>&category=&aplus=&$${beacon_mini}$$=&yunid=&=&trid=<trid>&asid=<base64 stuff>$${get_sign}$$&p=1&o=linux&b=firefox153&s=1920x1080&w=gecko&ism=other&cache=<7 letters>&lver=8.15.25&jsver=aplus_std&pver=0.7.12&_pw=0&_ph=0&tag=1&stag=-1&lstag=-1&_slog=0

Probably the audio file is coming from one of the unblocked requests but my Debian laptop does not pair with my Bluetooth earpieces so I can't test it.