Even if so, it would likely still have proprietary blobs, just embedded into a ROM or flash chip on the card. Personally, I'd rather have firmware loaded at runtime over hard-coded, at least then the blob is able to be reverse engineered possibly.
The best one right now is the OnePlus 6/6T, which has a relatively modern SoC.
Installing postmarketOS on it to turn it into a full fledged pocket PC. It now runs all your favorite Linux-compatible desktop applications except for those that don't have ARM64 versions, and even then emulation layers can fix this. It's not 100% as I haven't been able to get Steam working (it starts but errors out before the login screen) though I have seen some people have success on other distros so maybe it's a pmOS/Alpine/musl specific issue even though I was using distrobox with Debian to actually run it.
Yeah, that ship has sailed.
I don't use AliExpress often but for the commodities you want to stock your workshop with, it's often cheaper per unit with cheap shipping so if you want to order a bunch of something it's usually the way to go. Pre-COVID, clone Arduino Nanos were like $2 each on eBay but now they're like $5 at minimum. On AliExpress you can still ocasionally get them cheaper. I needed a bunch of them for a project and had exhausted my pre-COVID stash so I got a bunch on AliExpress and they work fine. For the less common stuff I'd not waste the time and just get it from somewhere with faster shipping. eBay often has free shipping on stuff while Amazon needs a $35 minimum if you don't have Prime, though I do make use of the free Prime trials and stock up when I get the offer.
Amazon and eBay are my primary places to get electronics/maker parts. I don't buy them for cosplay, but I expect the things you're looking for are available from either and likely for a better price than Adafruit. If you can tolerate the wait, AliExpress.
I use Fennec F-Droid on Android and LibreWolf on Linux/Mac/Windows.
The only mistake Billy made is giving anything to AdBlock Plus, the people who have sided WITH the ads, instead of uBlock Origin, the true MVPs of the ad blocking world. I guess uBlock doesn't accept donations unfortunately, but still, ABP is shady and I would not support them.
I just donate by whatever means the project offers. Sometimes it's paypal, sometimes patreon, sometimes GitHub sponsorship, sometimes something else like OpenCollective. Read the readme or homepage of the project to see what options they take.
Honestly, Mozilla has been peddling adware for a long time now. The writing has been on the wall. It started with putting sponsored links to Amazon on the Firefox home screen, then the shitty Pocket acquisition and the stupid featured stories/recommendations garbage, then the full screen Mozilla VPN ads...Firefox has been adware for a while. Use a fork that removes the bullshit. Switch to LibreWolf.
I'm not familiar with KDE's new feature yet, but if it only supports sysfs LEDs then it won't control 99% of keyboards. Few RGB keyboards have drivers that expose this interface. Most RGB keyboards are controlled from userspace on their official software on Windows, and that's also what most Linux projects that control RGB devices including my OpenRGB project do. I wonder if it would be possible to write an OpenRGB plugin/script that exposes a virtual /sys/class/leds/openrgb device that KDE could talk to, then translate that into OpenRGB calls to set the color on all available devices. It doesn't sound too difficult.
I don't care if it's "better" than the existing system, Mozilla should not be helping the advertising industry at all. They should be actively working to block any and all attempts to gain access to user data, flat out. They are not, and their acquisition of an ad company shows that their motives are not in line with what their users want. They're a company after money, no different than any other. Big fucking shame, but when you hire business people and operate as a business, you can't have true integrity no matter what your supposed mission is. Yes, Mozilla operates a nonprofit but they also operate a corporation, and the corporation exists to make money above all else which is why they've succumbed to this ad industry bullshit. I hope we see a viable third option for browser, but until then the best option is a Firefox fork that actually gives a damn about the user and not just their wallets. I've switched to using LibreWolf on all of my devices. Like Firefox, but without the anti-user, pro-ad-industry garbage turned on by default. I've been calling Firefox adware for years now ever since they started stuffing Mozilla VPN ads, sponsored link garbage, "Pocket recommendations" horseshit, and all the other paid/sponsored nonsense in users' faces without their permission but people were like "no no Mozilla is actually good"....cut it out, Mozilla has shown their hands very clearly now. They want the advertising $$$ and are willing to give up any respect and integrity they used to have for it. They aren't at the level of Chrome and Google, but they're inching closer every day and acquiring their own ad company certainly isn't going to help in that regard.