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In previous companies, I'd decided not to test against Skype plugin breaking my website's UI.

Is it common enough now that it should be tested, just as Flash is/was common place?

I have no analytics on how many users are having the Skype plugin installed which messes with the UI of any telephone numbers.

Having a hard time determining how to justify testing this and if there are other common plugins I should be aware of.

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AdBlock, NoScript, Ghostery... –  Edu Jan 14 '13 at 14:18
    
@Edu how many people run those ? I think those are more 'techy' rather than something like Skype. Interesting question though, I don't know numbers –  Phil Kirkham Jan 14 '13 at 14:42
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@PhilKirkham Good point. At least for adblock statistics are available at addons.mozilla.org/en-US/firefox/addon/adblock-plus/statistics/… and answer seems to be about 15 000 000 daily users. –  Edu Jan 15 '13 at 8:39

2 Answers 2

I believe most computer users in the general population do not install any plugins at all -- especially if you consider mobile users. Personally, I would not do any plugin compatibility testing without explicit evidence of a conflict.

By the way, this recommends a way to prevent the Skype plugin from breaking your page layout.

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I have always taken the approach that if people install plug-ins that mess with their UI, they are doing it at their own risk. It might be a good idea to take a cursory look at your UI while using some of those plug-ins, but I wouldn't spend very much time at all validating or developing around those plug-ins, except for very high severity issues.

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