This type of question comes up fairly regularly, so I'm going to quote myself. This was in response to a question regarding onscreen rendering of vectors, but it applies here as well, I think:
First, check your Zoom level and set it to 100%. For whatever reason, Fireworks often opens a document at less than 100% zoom, and this creates very bad looking results on the screen. You can find the Zoom level in the lower right corner of the canvas or go to View > Magnification. You can also use the shortcut Command-1 to set it to 100%, or Command-minus or Command-plus to decrease or increase zoom.
Second, realize that Fireworks is basically always in Pixel Preview mode. It's committed to showing you the pixels that will be rendered upon export as a bitmap. This is different from Illustrator, which was designed for print, first and foremost; Illustrator is not committed to a single output format and instead tries to render vectors as smoothly as possible on screen, at all zoom levels.
The second point, in particular, is important. Fireworks has great vector capabilities, but it was designed for the creation of bitmap graphics for the web, and its output is always bitmap only. If you're creating something for PDF output, I wouldn't recommend Fireworks; I'd use something intended for print output, like Illustrator.
Thanks for your help and insight.
I would like to use Fireworks for webdesign output.
I understand that you propose that I design in Fireworks at 100% magnification. Right?
Perhaps I could also open a PNG file with a higher resolution. This would perhaps render the text less pixelated.
The problem arises with I zoom into the text to control the quality.
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I wouldn't worry about print-size resolution (e.g. 72ppi vs. 240ppi, etc.) as it's not relevant to web output, but it is true that the more pixels you have to work with, the smoother the results. This means, for instance, you could create a document at twice the intended size, to effectively double the pixel resolution. Later, you could export the document at half size on output; in the end, you'd be back to the originally intended pixel size/resolution, but the bicubic rendering interpolation could provide a smoother rendering than the text rendering engine did at that size/resolution.
Be sure to try out the various Anti-Alias settings available in the Properties Inspector.
Here are a few threads discussing text rendering in Fireworks (and Photoshop) in some depth:
So I can create the document at twice the intended size for example 300ppi instead of 150.
You say: "Later, you could export the document at half size on output;"
Could you please indicate how the document can be exported at half the size?
Thanks for your help
There are multiple ways. I'd probably make a copy of the file using File > Save As, and then use the Modify > Canvas > Image Size command. Within the Image Size dialog, you can enter the size in either pixels or percent. Or, if Resample Image is checked, you could use the Print Size Resolution field to the cut the pixel dimensions in half.
Another way to output at half size would be to use File > Image Preview. Within the Image Preview dialog, there's a set of File options that includes Scaling, which you could set to 50%. This is a nice method as it doesn't require saving another copy of the file beforehand.
I'm assuming these two methods would produce the same output, but I've never tested it.