Mac Internet Browser Virus?

My browsers (both Safari and Firefox - I checked Firefox, even though I never use it) started acting really funny today. First of all, web browsing has become unbearably slow. Safari, which is usually lightning fast, is hanging on some pages when it tries to load. This includes Google, which is my home page.
More importantly, above each and every page, including this Apple page, there is a space for an ad bar. Sometimes an ad is visible, sometimes it's just blank, and sometimes there is a bunch of code (like an error or something). There is ALWAYS a small black click box with a white X in the upper right corner, which makes the whole space and bar disappear if I click it, but any page reloads will make it come back.
Anytime an ad shows up, before it happens, there is this little yellow or orange bird or chick or duck or something, pacing back and forth, whistling, with that gray spinning mac-like processing wheel in the speech bubble. Either that or the bird is sweeping.
This has to be a virus/malware/spyware, right? I mean, it's obviously some kind of "gotcha mac suckas!!" kind of thing. So how do I get rid of it?? I ran MacScan with no luck. And now I am running iAntiVirus but nothing has shown up yet. Where did this come from and how do I fix it?
Please help!! Thanks!!
P.S. I am new to Macs so I apologize if I seem totally inept/clueless.

I use Firefox, becasue I never put in the time to learn how Safari controls temporary/permanent cookie storage.
Firefox also has a large selection of add-ons to prevent javascript running or "tracking links" inside web pages, etc.

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To avoid confusion:
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https://db.tt/FUDxyQ5G
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Slow internet Browsing - tried everything except t...

Hi
New to the forum.
I have I think tried everything and still have slow internet browsing..on all devices, wifi and cable connected.
Speed test shows 6Mg which for us is about normal, but web pages all pause before loading...
Been through to BT faults and to second line, but apparently becasue the line tests at 6Mg everything is OK....which its not!
Swapped router, same.
Problem on Mac Book, Ipad, Iphone, and PC...Safari, Chrome, Firefox.
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Thanks
Here are my stats:-
Its a Home HUB 3, and I have done a quiet test and all OK
Speed test results
Download 6.94
Upload 0.15
Ping Latency 43.88
ADSL Line Status
Connection information
Line state:
Connected
Connection time:
0 day, 19:46:24
Downstream:
8,128 Kbps
Upstream:
448 Kbps
ADSL settings
VPI/VCI:
0/38
Type:
PPPoA
Modulation:
G.992.1 Annex A
Latency type:
Interleaved
Noise margin (Down/Up):
11.3 dB / 31.0 dB
Line attenuation (Down/Up):
12.5 dB / 9.0 dB
Output power (Down/Up):
17.9 dBm / 12.1 dBm
FEC Events (Down/Up):
562 / 0
CRC Events (Down/Up):
0 / 0
Loss of Framing (Local/Remote):
0 / 0
Loss of Signal (Local/Remote):
0 / 0
Loss of Power (Local/Remote):
0 / 0
Loss of Link (Remote):
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Mac Internet Browser Virus?

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