Firefox 23

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And for Chrome? I'd really prefer not to use Firefox anymore.

Jocelyn is correct about stopping Firefox from preventing the page to load. Here is a blog post by one of Mozilla's developers in regards to this feature they just added - https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/.

The relevant part that Jocelyn is referencing can be seen in the screenshot 

Apparently, Mozillia is looking into allowing users to turn off this feature on a domain level basis.  (One of the "bugs" they are working on is a whitelist capability for this - perhaps Marketo engineering should provide commentart to Mozilla on this?)

In the meantime, the footnotes and comments to the article that Jim L posted on the feature (Mixed Content Blocking) provide information about how to turn the feature off.

Basically you do the following:
To unblock Mixed Active Content, open a window or tab in Firefox and enter about:config.  You will get to a page that asks you to promise to be careful.  Promise you will be, and then change the value of security.mixed_content.block_active_content to false by double clicking it.

I have the same problem with FF 23 - I've had to step back to 22 twice to keep things working properly.  Do the landing pages work properly in Chrome?

I agree with Adam. I understand it's a change Firefox made, but this makes designing landing pages in Marketo practically unusable in all browsers, except IE which is not ideal to work in. Is there anything you all can do, like Adam's suggestion, to prevent this from happening?

I'm with Sam on this. How do we prevent this from happening, can we authorize marketo to access http content from an https environment? I have the same thing in Chrome. I currently use Chrome for all of my work, except landing pages and then I open Firefox. But if you can't see the CSS cause it isn't being delivered securely then you can't edit the landing page. 

Hi Sam,

This is actually a change that was made in Firefox by Mozilla, where it blocks http content placed on a https page. Please see - https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/ for more info.

Sure.. here is one https://na-sj01.marketodesigner.com/lpeditor/landingPagePreview?lpview=preview&pageId=2173&deployedLatest=true

When you view the approved page in Firefox, it is formatted correctly. But when you click 'Preview Page' or 'Edit Draft' for landing pages, the formatting is off, so is extremely difficult to edit and build.

Sam - can you send me some samples of landing pages that did not properly load.