You will not need to uninstall hitforker and will be able to switch between them at your leisure.
This is a modified version of HitForker. It is modified to generate a slack friendly export. The original hitforker included a button for IRC exports. That button has been removed and "SLK" was added in its place. Clicking that button will copy a slack friendly export to your clipboard.
Please see the acknowledgements section of code for more info and credit to original author.