There are many reasons not to use Chrome/Chromium over Tor.
As already pointed out, you will be easily fingerprinted. How many people use Chromium over Tor and with unique addons? The answer is a small subset.
Secondly, forcing Chromium to fetch content outside of the Tor proxy is apparently trivial. See here:
Finally, the Tor Project have themselves outlined numerous chromium bugs that means low-grade, privacy-by-design is currently impossible. Ignore their advice at your peril.
This includes (information is a little dated, but many concerns no doubt still apply):
- Proxy by-pass bugs allowing the direct bypass of incognito mode proxy settings;
- Browser state leak bugs leading to change from incognito mode to regular browser setting;
- Numerous third party identifiers; and
- Numerous fingerprinting issues that can’t be easily solved.
So, while Chrome/Chromium might have better sandboxing currently - which will be solved by Firefox in the next 3 or 4 releases anyway - your privacy will simply be blown out of the water i.e. you might as well raise a red flag to any network adversaries looking to track you.
With respect to MAT and jpeg, MAT states that the currently supported formats include that and more:
Portable Network Graphics (.png)
JPEG (.jpg, .jpeg, …)
TIFF (.tif, tiff, …)
Open Documents (.odt, .odx, .ods, …)
Office OpenXml (.docx, .pptx, .xlsx, …)
Portable Document Fileformat (.pdf)
Tape ARchives (.tar, .tar.bz2, …)
MPEG AUdio (.mp3, .mp2, .mp1, …)
Ogg Vorbis (.ogg, …)
Free Lossless Audio Codec (.flac)
But note warnings (also, not currently being supported by author for health reasons):
Why MAT is not the ultimate solution?
Mat only removes metadata from your files, it does not anonymise their content, nor handle watermarking, steganography, or any overly customized metadata field/system. Also please not that MAT does its best to scrub as much metadata as possible, it’s not really efficient at scrubbing embedded media inside complex formats. For examples, images embedded inside PDF may not be cleaned!
Other tools that may be of interest:
- Exiftool, a Perl application for editing metadata in a wide variety of files.
- exiv2, a C++ application to manage image metadata
- jhead, a jpeg header manipulation tool
- pdfparanoia, a tool to remove watermark from academic papers