Not sure if this problem belongs to MR, Kovid Goyal or me. If I click the word 'Calibre' at the start of the Calibre Forum description I get security related errors (see attachment). As well as getting it in Firefox, I get it in Chrome, Edge, Qupzilla and IE.
I clicked on it inadvertently, so it might not be a new thing. Although I think my mouse has clicked just under the forum name before and I landed at ==>>
http://calibre-ebook.com
Similar links for Calibre Companion and Sigil are fine.
Added - IMO putting links behind plain text is poor UI design, they should be differentiated. In this instance a link at the end of the text would be preferable - eg
Calibre Home Page.
BR