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Mozilla's Test Pilot add-on is rather basic when it comes to that. It reacts only when a 404 not found error is recognized by the add-on. The add-on won't display the prompt if a site returns a different kind of error, or is redirected.
The notification reads: "This page appears to be missing. View a saved version courtesy of the Wayback Machine".
You may click on the link to open the Internet Archive website to read an archived snapshot of the page on the site. Please note that you may middle-click on the link to open the page in a new tab in the Firefox browser.
So what happens if the page is not in the Wayback Machine?
About this Add-onSo voila... end of story
This add-on has now been discontinued. The next update will automatically uninstall itself from user's profiles.
So IMO this is a non-issue, especially if properly coded redirects to custom 404 pages are done either at the server level or the account level.
Further, when searching Firefox's Get More Add-ons for "Test Pilot" the Mozilla utility returned this message:
The title of this thread "Firefox wants to get rid of your custom 404 error pages" is a bit misleading IMO
[edited by: bakedjake at 1:53 pm (utc) on Aug 6, 2016]
properly coded redirects to custom 404 pages
joined:Nov 26, 2015
That, when placed in my robots.txt, takes care of the wayback machine and
takes care of Google's cache, which I noticed Yahoo has been serving up from Google lately. I've never benefited much from having archived copies of my site out there, in fact I feel it's cost me some visitors. But to go out of their way to force visitors not to see my custom error pages that have helpful links and such in them, game on... blocked.
<meta name='googlebot' content='noarchive'>
Seriously?User-agent: ia_archiverThat, when placed in my robots.txt, takes care of the wayback machine