How to find a simple WYSIWYG HTML editor like Seamonkey for macOS Sequoia?

I'm looking for simple WYSIWYG html editor like Seamonkey - which no longer works on my Mac running Sequoia


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iMac 24″, macOS 15.6

Posted on Dec 4, 2025 12:22 PM

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Posted on Dec 4, 2025 5:15 PM

I was able to execute the following Terminal command and get SeaMonkey working on Sequoia:


codesign --deep --sign - /Applications/SeaMonkey.app


And the refusal to run the newer 2.53.19 version required using System Settings -> Privacy & Security -> Allow SeaMonkey to run (or some words like that).


6 replies

Dec 5, 2025 6:36 AM in response to BobHarris

Thanks, Bob. I'll look into your workaround. Although I used command lines for years many decades ago (when running DOS), I shy away from them, and thus Terminal, these days - got too used to using a graphical interface. Same with html - first used Netscape's "Builder" (or whatever it was called back in the last century), then SeaMonkey for years until it would not work on my Mac (for the last several versions). Then a few weeks ago my domain provider took away the WYSIWYG editor they had and made me struggle with html again ...

So today I tried SeaMonkey 2.53.22 again after allowing it disk access through System Settings - Privacy & Security - and still got this: "Apple could not verify “SeaMonkey.app” is free of malware that may harm your Mac or compromise your privacy." I guess I'll try Terminal next.


Thanks again

Dec 5, 2025 8:45 AM in response to BobHarris

Thanks, Bob. I'll look into your workaround. Although I used command lines for years many decades ago (when running DOS), I shy away from them, and thus Terminal, these days - got too used to using a graphical interface. Same with html - first used Netscape's "Builder" (or whatever it was called back in the last century), then SeaMonkey for years until it would not work on my Mac (for the last several versions). Then a few weeks ago my domain provider took away the WYSIWYG editor they had and made me struggle with html again ...


So today I tried SeaMonkey 2.53.22 again after allowing it disk access through System Settings - Privacy & Security - and still got this:SO - then I tried opening SeaMonkey again, but this time in System Settings - Privacy & Security, a new box popped up that read "Open anyway". I did and I got SeaMonkey to open. It works, but wouldn't let me do some stuff for some paragraphs, like change font size. I got confused trying to edit the html so I settled for what I got, which was updating a file that had "important" new updates (for water beetle taxonomy - "meh" for most regular people, but beetle people care!!)

How to find a simple WYSIWYG HTML editor like Seamonkey for macOS Sequoia?

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