Nothing really ... but as of today I am getting a banner that says my browser (Firefox) will no longer be supported on Sept 1st 2023.
From https://slack.com/help/articles/1500001836081-Slack-support-...:
> Browser support lifecycle schedule > Browser version End of support > Chrome 105 and below Sept. 1, 2023 > Firefox 104 and below* Sept. 1, 2023