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'What's new' page broken

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The 'what's new' page displayed after updating 35.0.1 to 36 is broken - no buttons can be clicked. A carefully-timed interrupted page refresh gives me what I assume is the intended result. Removing "?oldversion=35.0.1" from the URI also unbreaks the page.

The 'what's new' page displayed after updating 35.0.1 to 36 is broken - no buttons can be clicked. A carefully-timed interrupted page refresh gives me what I assume is the intended result. Removing "?oldversion=35.0.1" from the URI also unbreaks the page.
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hi Jens_Lyn_IV, this is probably caused by the ctr extension. what would normally happen is a doorhanger panel appearing under the menu button, offering to take a tour through the new features of the release...

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Chosen Solution

hi Jens_Lyn_IV, this is probably caused by the ctr extension. what would normally happen is a doorhanger panel appearing under the menu button, offering to take a tour through the new features of the release...

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Thank you. I tried disabling my other extensions, but not CTR; the UI breaks in a weird way if CTR is disabled, and I have to manually restore it after reenabling the extension.

I thought there was no way to suppress the post-update 'what's new' page, but I discovered the browser.startup.homepage_override.mstone entry in about:config after submitting this question and set it to ignore.