Hi David Please check if you have the following files at C:\Program Files (x86)\Adobe\Acrobat DC\Acrobat\Browser\WCFirefoxExtn\META-INF in 64bit machine C:\Program Files\Adobe\Acrobat DC\Acrobat\Browser\WCFirefoxExtn\META-INF in 32 bit machine manifest.mf mozilla.rsa mozilla.sf If not, please update your Acrobat to latest version. If already updated, then try repairing it. Let us know if it works. Thanks Tanvi
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