Why does LR3 not produce sRGB compatible images?

An image that I fine-tuned in the Develop module will look flatter  (less-saturated) when exported as a JPG and viewed in a browser, if the  browser is not colour-managed. This happens despite the fact that the image is exported using the sRGB colour space.
If I view the JPG image with a colour-managed browser (Firefox with a colour-plugin) then it looks exactly like in the Develop module.
Why is that? If I select the "sRGB" colour space, I expect LR to not add a colour profile at all and create output that will look identical in colour-managed and non-colour managed browers. I certainly don't expect the output to look flat in comparison to what I fine-tune in the develop module. I selected "Only images with ICC tags." in the Firefox colour managment plugin and still it renders LR images differently than non-managed browers.
This is not an issue of being fooled by black backgrounds or something like that. Please see the attached screenshot showing a) Firefox colour -managed rendering, b) IE non-colour-managed rendering, and c) LR Develop module view. The effect is much more visible when the images are viewed large but you can still see the differences in hue and saturation of the greens and reds in the below screenshot between the colour-managed renderings (Firefox and LR -> left & right) and non-managed (IE in the middle). Other non-managed applications show the same rendering as IE.
The free Picasa application manages to procude output that looks identical in all browsers and the Picasa "Develop" view. Please see the second attached screenshot which shows the same browsers in the same order. (The images look different to the images in the first screenshot because I didn't spend a lot of time in Picasa to do fine-tuning and it doesn't allow the same control anyhow.)
I'm using LR3.2 on Windows XP.
I noticed a difference between LR Develop module rendering and viewing on the web (or other non-colour-managed applications) before but always put it down to a "black background" illusion.
I find it unacceptable that I cannot see what I'll get with an sRGB target space within LR unless the application used for viewing is colour-managed. Too many people out there don't use colour-managed applications and the Picasa example shows that it is possible to have a WYSIWYG approach.

The fact that the image is in sRGB, or any other space for that matter, does not mean it should look in a certain expected way in a non-managed viewer/browser.
The idea of sRGB is to be the standard colour space.  HP and Microsoft proposed sRGB to achieve the same effect that you get by transforming a media's colour space to the output space without the use of explicit ICC profiles. I understand that nowadays if something isn't explicitly colour-managed it implicitly uses the sRGB colour space. While uncalibrated monitors will not exactly comply (e.g., not have exactly a gamma value of 2.2) they are typically quite close. Are they not?
Also, if I calibrate my monitor (which I have), isn't the idea that if I feed it with an sRGB image in a non-colour managed application that the image will appear exactly as intended? I thought that a non-colour managed application simply ignores the media's colour space (assuming it is sRGB) but that the OS always uses the monitor profile (be it a standard sRGB one or a profile that resulted from a calibration). As a matter of fact, the latter must be the case because images in non-colour managed applications look differently depending on whether I have the calibration profile for my monitor active or not.
A non-color managed browser, like Internet explorer, takes the source color assuming it's sRGB (beit with an embedded profile or not) and does not convert to your monitor's color space, assuming all monitors' spaces are sRGB.
I agree regarding the assumption about the source colour space being sRGB but I'm convinced that the OS always converts into the monitor's colour space. That's what the .icm profiles are for. Are you saying that they are only used for colour-managed applications? Why do I then see a change in Windows XP's colours at the very moment the OS gets around making the colour profile active (during start up)? This overall change in display characteristics also influences non-colour managed applications.
Bottom line: use color managed software, do no trust or expect anything from non-color-managed software.
I general I agree with you but I thought the idea of sRGB was to make things work in the absence of explicit colour spaces. I cannot believe that calibrating my monitor (providing the OS with an individual profile of my monitor's colour space) only is supposed to make a difference for colour-managed applications. According to my understanding and my experience, the OS always applies the default .icm colour profile.
How do you explain that the Picasa output looks the same in Firexfox and IE? Are you saying that the absence of any colour space information in the Picasa output stops the OS from transforming from sRGB into the monitor's colour space? Wouldn't that be a stupid thing to do? Why not always transform into the monitor's colour space?
Have a look at bullet "4." of "Browsing Scenarios" in "A Standard Default Color Space for the Internet - sRGB":
4. Image in sRGB, and system has a monitor/output device ICC profile
In this scenario, the image has been run through a transform that consists of the input device ICC profile, and the sRGB ICC profile, or it was created using devices that conform to sRGB. Because the system has an ICC profile for the output device, the image can be converted to the output device's color space and imaged. The resulting image will be consistent across devices, and will be very close to the original in appearance.
Clearly there is a difference between LR's output and Picasa's output in terms of triggering a colour space transformation. Since I'm assuming that the transformation into the monitor's colour space always takes place, I came to the conclusion that LR's output is not quite sRGB causing colour-managed applications to perform a media colour space transformation.
To summarise: You are assuming that "non-colour-managed" means a) ignoring the media's colour space and b) ignoring the output device colour space. I'm assuming that "non-colour-managed" only means a) ignoring the media's colour space but that the OS always respects any present output device colour space profile.
I admit that I'm not an expert in these matters but I hope you see my points. Not always using the monitor profile would just be terribly daft and defy the purpose of calibration for all but the colour-managed applications. Further clarification would be much appreciated.

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