I've got this .svg exported using Fritling I can open it using my web browser but when I try to open it using Inkscape I can't see anything only a couple of borders.
How can I fix this problem?
The problem is caused by a known bug in Inkscape v0.91 and prior, that makes your image invisible when a font-size of 0 is used. The bug is fixed in the upcoming v0.92 release.
For now, you can quickfix your file by replacing all occurrences of
display="none" using a text editor.
If you replace
font-size="5", the texts become visible again in Inkscape, so you can remove them manually.