Well, I just tried again, and it stills works for me here just fine.
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This time I just
"cded" to the folder created after extraction, then moved the
firefox folder inside to
/opt, updated the paths in the
.desktop file accordingly, so they look now like
Code:
Exec=/opt/firefox/firefox
Icon=/opt/firefox/browser/chrome/icons/default/firefox.png
Notice that I renamed the icon
Code:
cd /opt/firefox/browser/chrome/icons/default/
then did
Code:
sudo mv default48.png firefox.png
searched for Firefox, and there it was, as you can see in the pic above. You could install menulibre - it's only 337kb - and check for errors in the desktop file.
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However, I did it and no errors were found, only the icon was missing
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The icon won't show on the dashboard, tho, but it does show in the "taskbar"
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So, I don't know what else you can do, as you can see it worked for me here. The only 2 things I can think of right now are
1. The theme is Debian's default, while you're using sweet, right?
2. Maybe you could try removing Firefox-esr, so the system only sees the other one.