Open browser : Cannot communicate with Mozilla Firefox


i have more or less the same problem as mentioned here:

For me it’s Mozilla Firefox that throws the error. I tried updating and later reinstalling Firefox and Studio and used the command-line as advised in the topic above.

IE and Chrome both work fine.

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Have you installed the plugin for Firefow?

You can do it by clicking on >
UiPath Studio > SetUp > SetUp Extensions > Firefox

Restart UiPath Studio and you are good to go.




the plugin is installed but i still get the error. Also tried running Firefox with no other plugins or installing it and running Studio as admin.

is you firefox version up to date??

@Gabriel_Tatu yes, it is the current version of 50.1.0

However, I also just got it working. Now I’m using the 32Bit eng(british) version of Firefox
I also tried 64Bit de, 64Bit eng(british), 64Bit eng(Us) and 32Bit eng(US), but for whatever reason they didn’t work either.

For the record, I had this problem ever since updating a 32Bit de version.


Not sure why it is failing in 64 bit version. But once we uninstall & install 32 bit version it is working fine.