At least they apologized for their accusation about security.
Of course "inconvenient" and "not ideal" are massive euphemisms, but this is the situation.Helen, Slack wrote:Firstly, please let me apologize for the confusion here. While we understand that Pale Moon may be inline with current security practices, we cannot ensure planned improvements and upcoming feature releases for Slack will be supported.
As a result, we're discontinuing support for Pale Moon and other, less common browsers. To be clear, re-adding support for Pale Moon is not something we will be reconsidering at this time. I am very sorry about this.
We know this situation isn't ideal and we don't take this action lightly. We want to push improvements to our software as quickly as possible and, as a result, we need to focus and restrict our support going forward. I understand this is very inconvenient and am sorry that I don't have better news for you here.
There's no inconvenience if there is no service. A warning apparently wasn't good enough.
It looks like if you insist on continuing to use this service despite their refusal to consider letting "less common" browsers in, then you will have to add a useragent override to pretend to be one of their "favorites". Nothing else can be done on our side.