I am experiencing change of font size and color in different lines of the whole text. There is no problem in IE. But when I want to view the Publish course(CD) in Firefox it changes the size and color of text within the paragraph and headings on some slides. Any one help me with this?

Hi
I'd suggest that you look at the code behind the text.
With a text box open for editing there's a button on the second icon row, far right which will show you the html code used.
What you should see is a "<span" at the beginning showing your chosen page font and size. All there should be after that is text until a "</span>" at the end.
What you will probably find are more of the same ( span font etc )in the text which you don't want.
If you've copied the text from a web page or an MS Word document then the formatting codes are carried over with the text which really messes up the display in courselab.
Even if you select all of the text and apply formatting within Courselab the underlying embedded code is still there so what is finally rendered on screen depends on the browsers WC3 standards compliance. MSIE doesn't apply the formatting as precisely (it uses as very MS centric schema) Firefox is more compliant so actually uses the embedded formatting hence the original formatting shows through.

Answer is use a clean source for your text. Copy & paste into notepad to remove the source formatting then cut & paste into the text box.

Sorry keep forgetting this uses the tags you type in so the missing part is from line 4:
What you should see is a 'span font....'at the beginning showing your chosen page font and size. All there should be after that is text until a /span at the end.
These will be wrapped in < > symbols