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sometimes before a some working time in app appear this, browser window became so small that i cant see anything.
Are you sure you're not using any browser actions in the script? It would be great if you attached a test script to your answer.
Pixelscan is not reliable. It shows also with standard out-of-the-box Chrome and Firefox that my fingerprints are inconsistent.
for example, for some reason when i launched BAS editor second time, it started not editing the most recent version but some other: alt text
and thus the 5kb reduction size in backups.