Firefox Portable 117 or 118 always closes abruptly when downloading any file from the internet, I tested the normal version (installed from the official Mozilla website) and the error does not happen, I copied the profile recently created by Firefox to the Firefox Portable folder and the error It didn't happen either, I think it has something to do with the default Firefox Portable profile.
I wanted a way to resolve this error because I don't want to have to recreate the entire profile from scratch, customize Firefox and my extensions.
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Try a fresh installation. Then → If the issue may be reproduced: it's a 'portablelization' issue. Otherwise, it's a local misfunction.
“Life is a strategy game, where roles are already distributed”
― Neo Buddha ―