Now what? Is it my old iMac?

[Sooz]

I can't even find you, even when I type in techsurvivors.net using Firefox or even Opera! I had success using Safari on my (very old!) cell phone, and did a copy of the web addy to get to here on my (sooo old I guess) computer.

Is my computer so very old?   
Am *I* so very old!?    Ok, no answering that.  Apparently I cannot even Preview!

Just in case I totally lose you, and you want to be pen pals with someone who will continue to pick your brain (and be glad to hear from you!), here's an email that I check every few days (remove the spaces of course):

tea   cher  in  put 
@    ya   
hoo   .    com

Smiles, <----- not part of my email
Sooz

[Xairbusdriver]

Couple of things:
1. It might help to use https:// (note the "s") instead of the old http:// (note lack of an "s"). But the weds/browsers are pretty good at adding that in their DNS trips. Usually, you don't even need to add the "https://" to just the sites name.

2. Look for a "History" item in Firefoxes menu. There should be a "Clear Recent History..." item in there. Use that and clear out the recent sites you've visited.

3. As long as you are in Firefox, make sure you have the latest version that will run on your Mac. Looks like I have a 64-bit version: 126.0.3 (64-bit). Your Mac may not use 64-bit CPU's. Just use the "About Firefox" (under the "Firefox" menu) and use any "Restart to update" button that may be in the About window. There should be a "Firefox Updates" section in the Settings... (Preferences).

Firefox 48 was released on August 2, 2016. ... It is the last Firefox version to support Mac OS X Snow Leopard, Mac OS X Lion, and OS X Mountain Lion.[128]

Just for grinz, how are you trying to get into a TS Preview display?
I am assuming that there is an actual "Preview" button next to the "Post" button?

Of course, it usually helps to share most of the info in the "About This Mac" window. At least the "Processor", "Memory" and "macOS" info.

Lastly, let's not talk about that three-letter word...