1. In PHPFusion v.7 / 8, images in comments and on the forum, when clicked, opened in a new window in their original size. Would it be possible to implement this feature into v.9? It was very useful especially for plans, diagrams etc. I know you can click RMB and choose "show image" but it's not the same

2. Is it possible to add in v.9 filtering of articles and news - supplement with the most popular (the highest number of views)? It is currently: newest, most commented and top rated.

Yes, we can do both.

Will it be in the next update or as a modification of the relevant files?

Update, of course.

The first one is done.

Filter "Most read" was added to articles, blog and news

After updating to v9.10.20, the ability to open images in a new window in the comments has disappeared. Can you please indicate again which file to modify in order to restore it?

Solved:
the img_bbcode_include file should be taken from v 9.10.00