I've made a user script which enhances esoui.com. In order to use it you will have to install the Greasemonkey (Firefox) or Tampermonkey (Chrome & others) extension in your browser.
Afterwards you can click this link to install the script.
Right now all it does is search and reformat ingame errors in forum posts and addon comments.
Before:
After:
The "show" buttons passes the given line to a custom "esoui-dev:" protocol. A handler program can be set up to then open the file in an editor of your choice.
Use the following steps at your own risk. Don't come crying in case your Windows stops working and all your files have been deleted!
Warning: Spoiler
For Windows you can use these files as a starting point.
Extract both files into some directory
Adjust the open command in esoui-dev.reg to point to esoui-dev.vbs
Import esoui-dev.reg into the registry
Adjust esoui-dev.vbs to point to the correct source directories and use an appropriate open command for your editor
Visit "esoui-dev:setup" in your browser to register the handler for the protocol
In Chrome 77+ you may need to follow these steps to permanently allow the protocol and get rid of the confirmation dialog.