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Worth mentioning is perhaps even more that I have previously switched from a multi-site back to a new single WordPress installation.

I had the same problem. However, I was able to solve the problem by restarting the PHP process (service php5-fpm restart).

By the way I use the PHP5.5 + OPCache.

I’ll probably add an option in the next version, so a separate compressed javascript file is created for the footer. This is definitely better than exclude many scripts and load them all separately.

This is not really a bug, because the goal of WP Minify Fix is to put all javascript files into a single file.

If not all scripts should be placed in the footer (as you can about the settings), so there must be at least two different JavaScript files (one for the footer, and one for the header).

But I think it would be ideal if there was only a single JavaScript file, because that is the goal of the plugin.

IMHO should jetpack as suggested by you pack a document.ready wrapper around their script. Another possibility would be that WP Minify Fix wraps a document.ready to all scripts that are placed in the footer, which would be expensive to implement.

Or it would just be two JavaScript files. But I think that’s suboptimal.

Yes, it works under WordPress 4.

WP Minify Fix transmits the entire HTML page to the Minify-Library, which then also the JSON data is included. Therefore, this issue affects actually Minify.

But I could also catch this bug, if I remove all line breaks after compression.

WP Minify Fix uses the software library Minify to compress the HTML document.

Please check it with the current version of WP Minify Fix. If the problem persists, then please get in touch with the developers of Minify, to fix this bug. https://code.google.com/p/minify/issues/list

I have now reported the problem to the developers of the used Minify engine: https://code.google.com/p/minify/issues/detail?id=315

Has this problem been done?

What do you want to achieve with such a function? Would it be enough for you to exclude individual CSS and JavaScript files from the Minification?

Yes, about this feature I’ve already made ??my thoughts.

I will add such an option in the next version.

Is the debugging console of Firefox returning an error, when you load the page?

Yes, update to the new version 1.3.0, then the custom header is displayed above the menu.

How is Masonry loaded exactly? Directly via an HTML tag such as <script src="/path/to/masonry.pkgd.min.js"></script>, or asynchronously via another javascript?

Is your browser console returns an error?

For me work all my websites which I minified with WP Minify Fix, even in Firefox.

Which version of Firefox you are using, and under which operating system?