To download larger manga (ex. full volumes), you will need to set Tampermonkey's Download Mode to Browser API:
Go to Tampermonkey's Settings page.
Set Config mode to Advanced.
Scroll down to the Downloads BETA section and set Download Mode to Browser API.
Click Save.
Click Ok to allow Tampermonkey to start instant downloads.
If a dialog pops up, click Allow to give Tampermonkey permission to manage your downloads.
Disclaimer
Does not download at the highest resolution possible from cmoa.
Instead of downloading the images from cmoa's CDN and descrambling them, this script downloads the images as they are displayed on the browser. This means resolution may be lower than expected. If you want the highest possible resolution, I recommend looking into alternatives that descramble the CDN images.
Does not guarantee that pages downloaded will be the same resolution, since cmoa will sometimes send pages with lower resolution to the browser.
If this is important to you, make sure to check the resolutions of all pages after download.
Does not support downloading light novels or comics accessed using Yomiho (cmoa's subscription service).
Unfortunately, updates and support will be sporadic due to my schedule.
I have not tried this personally, but it is an actively developed and maintained project. A look at the source code shows that they were able to reverse engineer the descrambling algorithm used on cmoa, so the images may be the highest possible resolution.
