Why does this type of advertisement solution appear at the bottom of the host?

Why is this type of advertisement displayed at the bottom of the host? I thought it was only available on my host. I didn't expect the company's host to have such advertisement. I couldn't see the code when I checked the source code, only firebug can be seen. although you can click to hide it and it will not appear again, you may not be able to figure out where it comes from. Is it possible that the network vendor did it? I used the telecom network. when I opened my browser for the first time, there was their advertisement. The host cannot be browsed without being switched off. why is this type of advertisement displayed at the bottom of the host?



At first, I thought it was only on my host. I didn't expect the company's host to have such advertisements. I couldn't see the code by checking the source code.

Firebug can be seen, although you can click to hide it and it will not appear, but you cannot figure out where it comes from

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Maybe it's a network vendor, right?

I used the telecom network. when I opened my browser for the first time, there was their advertisement. Unable to browse without turning it off
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Advertisements are everywhere. If you change your browser to prove that you don't know.
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Discussion

Maybe it's a network vendor, right?

I used the telecom network. when I opened my browser for the first time, there was their advertisement. Unable to browse without turning it off

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Delete and reinstall