Hello, Dody and Zubby...

Here is another idea to improve the SEO of your script.

I added it on other websites and it worked.

The idea is the creation of "fake" H and H2 tags

The most useful fake H1 tag could be in each browse.php page, to tag the name of the category in the "path" (but just the last right part of the path, not the whole path).

To prevent the diplay of giant fonts, you must add a special category in the css style file for H1, H2, etc.

I think that Google could appreciate to see the name of the category in H1.