could be I've missed something here but I'm wondering why a simple tab grouping option wouldn't be a better(?) option?
FWIW I have a similar use case but I use the Bulk URL Opener (
https://chrome.google.com/webstore/detail/bulk-url-opener/kgnfciolbjojfdbbelbdbhhocjmhenep) xtn in Chrome. Some require a login, but once they;ve been opened once I don't need to log in again during the day (should I revisit a site).
There are also xtn's that unload inactive pages or collapse multiple tabs to a single tab or 'menu' (saves RAM).
YMMV but why add another app when the functionality is built into the browser