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If memory serves me, MacOS uses Lucida Grande and possibly Helvetica as system fonts, so in theory if you replaced those fonts with the font you want to use MacOS will use them instead (meaning delete/rename them)
 
would u by any chance happen to know where i can find those fonts? adobe's and apples?
 
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The system text is lucida grande, not myriad. Helvetica is used on iOS (though let's hope it never transfers to osx- it's a god awful type for screen). You are unlikely to get a font you set locally to work online: websites are generally coded to a specific set of font selections by the designer/maker, often for enhancement of the content (you won't but a book you can change the font to something whimsical; you have to be able to read it without noticing it).

That said there are ways to change the system wide font: should you indeed want myriad over the system default
 
Yes, I would really want Myriad over default fonts. I searched the web but didn't find anything.

Do you know, how I could do this?
 
Silk (by unsanity) or Tinkertool should be able to do the job for you. I believe tinkertool does not let you change menubar fonts though. Silk may do so but i can't provide any more info than that as personally, i like the default option.

any customised versions i see usually look a little odd and impact legibility.

have fun!
 
Thank you very much, you've been very helpful to me. I'll try that.:D

Have a great day! ;)
 
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