This script adds some functionality that I felt was missing from Manganelo. It lets you go to the next chapter by pressing your right arrow key, and the previous chapter with the left arrow key. Additionally, it removes the space between the pages on series that you specify.
Webtoons tend to look bad on Manganelo, because there is a small space between the pages, and sometimes it causes a gap in the middle of an image. However, actual manga and a lot of manhuas have well-defined pages, so I think they look better with the space present. Because of this, I wrote the script to only remove the space on titles that you specify. Here are before and after images in case I'm not explaining it well:
Without the script:

With the script:

I have already included a few titles in the script, but if yours isn't on there, you can add it easily. Just add the title to the titleList array in the script. It will probably be obvious how to do this from looking at it. However, I'll go ahead and mention that the titles are case sensitive, so make sure you don't accidentally have extra spaces in the front or the end of the title, and also capitalize it exactly how it is on Manganelo. Make sure there are double quotes around each title, and there should be a comma at the very end of each title, except for the last title in the list. I'll include an image just in case that doesn't make sense:

The list of titles that are already included in this script is pretty small. I haven't been reading many webtoons lately, and I lost all of my bookmarks when KissManga shut down, so I just quickly came up with a few off the top of my head so that there would be an example for people to easily follow and add to. Feel free to post your own title lists in the feedback section, or email them to me at [email protected], and I'll add them to the script.