Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Are you able to print successfully from any other browser, or any other program?
Is it just the TenfourFox browser that crashes and cant print, or are you not able to print at all?
My sincere apologies for the delay, Ive just seen your replies.
lets test and see if this is an issue with tenfour fox first.. lets try resetting the browser. Heres how to do so whether you are using an older version or a newer version.
Afterwords, restart your mac and then open tenfour and see if you can print to the HL printer. If you get stuck or run into any issues or even if this works, please let me know the outcome.
My apologies for the delay in getting back to you, Ive just returned from dinner and running a few errands.
I agree with your concern 100%, a returning issues usually does signify an underlying issue. The steps you mentioned all seem to be solid steps. Can I ask if you h ave tried a permissions repair and disk repair using disk utility?
Lets try both, heres how to get there.
Open your finder ( magnifying glass ) type in disk utility, and launch the disk utility application.On the left side of the disk utility window, click your mac hd, then at the lower right hand side, click repair permissions .
Once repair permissions is complete, we next want to try and repair disk, and let that complete.
Avast is free, and should be able to run on Leopard. https://www.avast.com/free-mac-security
Let me know if you encounter any issues installing it and Id let it run a scan overnight just to be safe.
Sounds like your an old mac pro. A small piece of advice, avast does tend to use a lot of your resources ( ram, processor, etc ) while its running.
So I usually wait to run a scan with it until I do not need to use any other resource intensive programs.
Just wanted you to be aware of the machine slowdown that occurs in case you have any work to be done.