it looks like this subject hasn't popped up in a while - creating new thread. this morning i auto-updated firefox portable using the platform, and immediately got "firefox couldn't load XPCOM" i ran through some forum recommendations, tried to reinstall, i download a clean version of FirefoxPortable_66.0.3_English.paf.exe to run clean, independently with no imports or changes and it gave me the same error. the solution was to download the previous version FirefoxPortable_66.0.2_English.paf.exe, install over top of my existing version. firefox immediately worked again, with my profile, bookmarks, saved logins all intact. [windows 10 Pro 64 bit] - LONG time portable apps user, found this very unusual.
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the xul.dll (md5 6ad6f745d17d2f33fa53e439ac409bde) seems getting blocked by some identity protectors.
i have webroot running on my system, but don't have any alerts or reporting indicating any issues. also - have now had to reinstall the previous version a few times now when this error pops up. i have now disabled updates within firefox - will see the result, but keep ignoring the portable apps prompt to update.....