Modifying the Settings UI

I'm using Firefox for Windows and usually have a few set pages that appear every time I open a new window. Every now and again, I have to add, remove, or change one of these pages. The issue is that I have to see something like this whenever I want to change anything. `https://link1.url.com/|https://link2.url.com/|https://link3.url.com/|https://link4.url.com/|https://link5.url.com/` Naturally, whenever I open a new window in Firefox, this is automatically interpreted to open multiple pages. However, this way of displaying them is still inconvenient. I want to know if we can get something more like this. [https://link1.url.com/] [https://link2.url.com/] [https://link3.url.com/] [https://link4.url.com/] [https://link5.url.com/] Is there a way to edit the Settings UI to see a multi-line list with the ability to add, remove, or change these links individually? Thank you.