Hey MV - been tinkering with settings, or have a software upgrade changed things (screwed 'em up

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Here's what's happening... when posting now, it appears either javascript or Java have been enabled, thereby eliminating the "code tags." Instead, if I highlight text to be manipulated (bolded, color change etc.), the modifications are made in the posting box instantaneously, rather than allowing me to see the code tags.
This REALLY sucks, to wit: ever try reading yellow text on a white background - almost impossible, plus I'm then unable to modify my text, as the software will not allow me to place my cursor amongst the text to edit. There are other examples, but I think you get the idea. These new settings make it infinitely more difficult to edit/modify my posts as I type them... I was going to post twice this evening, but gave up, as I could not achieve what I used to be able to accomplish with ease. HELP!
My computer settings have not changed, nor has my browser - currently FF 10.0.2