Certain Firefox users may come across a message in the extensions panel indicating that their add-ons are not allowed on the site currently open. We have introduced a new back-end feature to only allow some extensions monitored by Mozilla to run on specific websites for various reasons, including security concerns.
What is this bullshit? Feel like this will lead to adblocks being blocked for certain websites under the guise of "security", aka: we don't have to justify shit to you.
It's not going to inconvenience you that much, and the proof for that is that this has always been the case: extensions would never run on e.g. addons.mozilla.org. This makes sense; you don't want extensions to trick you into installing other extensions, for example, or to hijack your sync password.
It looks like the main change is that this actually loosens this restriction: it looks like some trusted extensions from now on will be allowed.
So it looks like it's mostly to do with the account system of Firefox. I'm not sure why their websites would need special protection, but whatever. It's not malicious, for now
So allowing any random, possibly compromised, possibly installed by malware, add-on to run during the Firefox account login pages (see the list of URLs in this thread) isn't a security concern to you?
To me it sounds more like they plan on blocking all addons (other than some whitelist of "trusted" addons) on important pages (like the Google login page maybe?).
On Linux, middle clicks on the new tab button will now open the xclipboard contents in the new tab. If the xclipboard content is a URL then that URL is opened, any other text is opened with your default search provider.
Because Windows doesn't have two different copy/paste mechanisms like X does.
(X has "highlight text to copy"/"middle-click to paste" and "ctrl-c to copy"/"ctrl-v to paste", which have completely different origins (homegrown Unix vs. copying Windows) and don't even share the same clipboard. Frankly, although it can be useful it's also kind of a mess.)
Of particular note: This is the last version that will support macOS 10.12 (Sierra), 10.13 (High Sierra), and 10.14 (Mojave). They'll get an extended support release of Firefox 115 that'll receive security updates for ~1 year. Source: mozilla.org