Since around last week (118.0.2 on Windows 10), links that are supposed to open in new tabs by default, such as the join link for a Blackboard webinar which opens in a new tab, aren't. When clicked, they don't do anything. Manual "open this link in a new window" links work, but windows that are supposed to automatically open in new tabs aren't responding. I have pop-ups turned on for the relevant websites. Here's the list of add-ons I have, but I don't think any of them are likely to interfere with tabs.

AdNauseam Behind The Overlay Block Site Bypass Paywalls Clean Decentraleyes DownThemAll Ecosia Facebook Container FastForward Firefox Multi-Account Containers Firefox Relay FoxReplace Greasemonkey Indie Wiki Buddy KeePass Tusk Privacy Possum uBlacklist User-Agent Switcher WebP / Avif image converter WhatCampaign Youtube to MP3