New bugs introduced in latest commit

[StylusEcho]

First of all thank you very much for implementing #16, from initial testing it seems to work exactly how I imagined.

However it seems like a couple of of bugs have been introduced.

1. Under certain conditions, the textbox for tab_configs.csv doesn't seem to go away on Microsoft Edge, meanwhile on Firefox it disappears about the same time that Extra Networks are fully loaded. In these instances, clicking Save does not save any changes to the file either. There appears to be some correlation with the number of extensions installed, or it could be caused by a specific extension, still investigating.
2. With Lobe Theme installed, above Tabs Extension these empty blocks appear: