How to fix "https" to "http" in Opera 12 in built-in mail/rss client (M2)?

Question

Opera

Tell me, please, for Opera 12.14 x32 (windows).
At the beginning of the summer there were problems with habrastorage via https. I had to enable TLS 1.2. Then something changed and https pictures began to work as before, via TLS 1, but slow down. The brakes on the page were treated by userjs, which replaced the https protocol with http in the links. And everything seems to be fine.
But in the mail-rss client built into the Opera (M2 seems to be his name), the pages coming from rss habr (giktime / megamind) contain https links. And slow down and strongly. That is, the user script described in the post at the link does not help.
The client saves each news as a *.mbs file and stores it by year\month\date in (for example): \Opera\profile\mail\store\account2\2015\07\22\48884.mbs
If you open .mbsfile, renaming it as an archive (.mht), then there will be a single html file where links occur, such as:

<img src="https://habrastorage.org/files/6cc/b5c/a6b/6ccb5ca6b83843389c972520e56ae065.jpg"/>

But how to work with it? userjs files that fire on the site do not fire when viewing the rss feed in the M2 client.

Is there a solution for link substitutions in what the built-in rss client produces?