During testing of a new version 2.0 release of my Firefox extension,
Clippings, I noticed that Firefox won't update the extension from a
previous release either automatically, or manually in the Extensions
window, unless I clear the browser cache first.
The extension is hosted on the Mozdev site for my project
(http://clippings.mozdev.org); it is not yet uploaded or approved on
Mozilla Addons. The update manifest, update.rdf, which is stored on the
Mozdev site for my project, has been updated for the new version of
Clippings. I've confirmed that the <updateURL> property in the manifest
file for the old extension version that I'm upgrading from is referring
to the correct URL.
This is reproducible across three computers with Firefox 1.5.0.4
installed (both Windows XP; one of them belongs to a friend). This
problem doesn't occur if I update from, say, version 1.0 to 1.2.1 of my
extension - only when updating from 1.x to 2.0.
Clearly this would be a barrier to existing users, as not everyone
thinks about clearing their browser cache first before doing an
extension update. Is this a problem with browser settings, or is it a
problem with the update manifest itself? Any help or pointers on how to
resolve is appreciated.
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