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Page with <object id="defaultFormat" format="SVG"></object> won't load

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One of our web site generators produces a home page that won't load in Firefox 4.0. It loads in older versions of Firefox and all other browsers. The home page just defines a frameset with two side-by-side frames. Each of the frames load by themselves.

Found that if I comment out the <object> tag found in the head of the home page, everybody is happy -- i.e., it works in Firefox 4. Is this a new feature?

One of our web site generators produces a home page that won't load in Firefox 4.0. It loads in older versions of Firefox and all other browsers. The home page just defines a frameset with two side-by-side frames. Each of the frames load by themselves. Found that if I comment out the <object> tag found in the head of the home page, everybody is happy -- i.e., it works in Firefox 4. Is this a new feature?

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SVG should work in Firefox 4. To see whether this problem is caused by the new HTML5 rendering engine, you can toggle it off or back on again like this:

(1) Type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the filter box, type or paste html5 and pause while the list is filtered

(3) Double-click html5.parser.enable to toggle it to false or back to true.

Then reload the page.

Does that make any difference? If so, there could be something a little bit wrong in your HTML or CSS -- or you have found a bug.