Photos in this post will change, and links to the photos will change, as I work out some issues with my image hosting site, MediaFire and play with other image hosting sites.
Testing to see if the image links break later.
mediafire link this photo:
s
mediafire link this photo
mediafire link this photo
.
.
imgur link this photo
New test
Appear broken now. 
Use https://imgur.com/
Odd, they show for me, three different browsers.
What about the last photo (imgur link)
Firefox and Edge work for last photo. Negative for other ones.
Different results if you post them, vs someone else simply looking?
Ah, what Robin Dobbie said. That worked for me also, but does not show up without the extra steps.
OK. Looks like I will no longer use Mediafire - and use imgur for all future posts.
I have a paid account with Mediafire and I will have to keep it, because I have three years of BLF posts/images hosted through them. All the old images still work. But they changed their "share" menu, which no longer works reliably for image hosting.
Try imgbb, it’s free and gives you several options for posting.
Yeh, these 3 are the only ones I can see.
Imgur’s broken. Need certain browsers, or the pix don’t show. Using FF both from home and at work, and can only see pix from home, not from work, and oddly my browser at home is older’n this one at work. Go to the site itself, and I just see a blank dark-gray page with nothing on it, from both browsers.
And “Use a different browser” is NOT a solution.
A few days ago, I went through many many BLF posts looking to see what image hosting other people were using. By a wide margin, it was imgur. For really old posts it was photobucket.
This is the first time in three years (since I've been a member) I've heard anyone say they had problems with imgur.
What BLF rules does Imgur break?
I’ve said it at length but gave up because all I got was “FF sux, use a different browser”, and I know at least one other person here who said the same (no images showing) about imgur.
Normally, the only time I even notice is in reviews.
If someone posts “I modded my ASDF90 to take a XHP70.”, great. If I don’t see an actual pic, I just figure it was a text-only message.
Only if (eg, in a review) someone posts “Here’s a beamshot with the old emitter and next to it the new one.”, then it’s like, “Aha, there’s supposed to be a pic, but I can’t see it.”, and then I know something’s missing.
I've been using Firefox for almost twenty years. No real issues. I just don't like it when they change too much at once (like the latest update, that came out last week, version 89).
At least at work, I’m using whatever’s the last version that IT pushes out, but also at work and at home, I use the latest non-quantum portable FF.
Since quantum, too mush shiite just plain broke, especially goggle-related stuff (gmail, etc.). Also, turning off js Is Just Plain Broken. Pre-quantum, prefbar would cleanly turn off js, but quantum version only half-turns it off, ie, you can still get js-driven crap (maybe by design??), so it’s in that half’n’half twilight zone.
It’s made that much worse that POS websites now rely on that, eg, “lazy” image-loading, etc. And no one designs their own clean websites anymore; they just use these canned libraries and templates so you have a brazillion copies of the same POS html/js code floating around out there.
Regarding the pictures in Terry Oregon’s first post in this thread.
Using Firefox:
The first 3 images on Mediafare do not display.
The 4th image on Imgur works fine.
So I take that when you claimed that Imgur images break a bunch of BLF rules, you were just making things up...
That reminds me of my Canadian girlfriend.
She's always making things up.
What's her name, you ask?
Well, her first name is, umm, Canadian, and her last name is, umm, Girlfriend.
You can't meet her, though, because she's in Canada, you see, but trust me, she's real. 
Terry,
Using Firefox or Edge, (Win10) or Safari (- IOS Tablet). I don’t see the first 3 images. The 4th is displayed.
When I right click on one of the not there image blocks and select open in new Tab, I get:
URL: File sharing and storage made simple
Generating new download key
We are generating a new download key for this file.
Restarting download in: 5 seconds
It’s not working
Don’t know if this is any help.
All the Best,
Jeff
Then give specific examples of every rule that is being broken.
Terry,
When I copy the image link on one of the non-displayed images and paste it in a text editor, the URL does not end in JPG.
I think (notice the word think) BLF image links must end in JPG. Or perhaps another image file format.
All the Best,
Jeff
@Terry Oregon:
I've never used MediaFire, but if they provide what is commonly called a "direct link" that has an extension like jpg, that is the one you want to use.