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Editorial Team
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Asked: 2026-05-26T17:18:09+00:00

In Firefox version 7.0.1, URIs with encoded spaces in them are automatically converted to

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In Firefox version 7.0.1, URIs with encoded spaces in them are automatically converted to a space in the Location Bar.

This does not happen in Internet Explorer.

For example, I have a textbox on a page with contents of “Test Test”. I have a javascript function that reloads the page with the encoded contents of the textbox using encodeURIComponent().

Internet Explorer produces:

http://host/page.php?box=Test%20Test

Firefox 7.0.1 produces:

http://host/page.php?box=Test Test

Upon alerting out the results of encodeURIComponent in Firefox, the space is correctly escaped as %20.

It appears Firefox is doing something that is removing the encoding from the URI. This then results in the URI not conforming to RFC2396

My question is what should I as a developer do? In fact, do I need to do anything?

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1 Answer

  1. Editorial Team

    This applies only to the URL field that Firefox shows to the user, not the actual request that gets made.

    If you look at the request in Firefox 7 on Windows 7, you will see that the spaces get URL encoded:

    enter image description here

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