I just tested it on a fresh game, since its been updated, and its still working for me. I'll break it down step by step. Note that I'm using Chrome x64. It may actually be double on firefox, I don't use firefox though so I haven't tried that, who knows. I'll post a basic guide, you should really check another thread for a better guide and actually learn cheat engine though.
First, load a new game in one tab, and get past the first cutscene. Then, while its running, open a new tab (ctrl-t) and enter into your url bar about:memory and hit enter (no http or anything, just type it in to the bar exactly like that, about:memory - it will load chrome://memory-redirect , but about:memory is easier to remember and type )
Look at the list of processes, one will say Play Crush Crush. You need the Process ID number of that process.
http://i.imgur.com/QJkKxEN.png
For me this is 11640. You can close the memory tab now, but do not close the game tab; if you do, you'll have to start over.
We need to convert this to hex, so open up calculator and go to programmer mode (or use a web-tool, or do the math in your head!)
http://i.imgur.com/rGmiwhs.png
For me the hex address of the process is 2d78.
I open up Cheat Engine 6.5 x64, and select this from the process list.
http://i.imgur.com/Z8p303J.png
I now change the search type to float, and enter 1.0 and press first scan. This gives me a list of all the addresses that have the float value 1.0. You can press next scan a couple times if you want to shave off a handful of addresses, but its not necessary.
http://i.imgur.com/WQJEpIH.png
At this point, I play the game for a couple minutes, until I unlock the 3 hobbies with tech-savvy and motivation skills, and make sure every skill has been trained at least once. The next two girls unlock. At this point, if you go to the stats tab, you will notice that on reset, you gain .7 multiplier. I press reset, and after going to the stats page, I confirm the multiplier is 1.7 (make sure you confirm the new multiplier by going to the stats page, since it could be off by .1 due to rounding).
http://i.imgur.com/3aPGHSM.png
I enter the new value into cheat engine, and hit next scan. I have one result, but in the past I've had as many as 4 - if you have more than one, try them one by one.
http://i.imgur.com/7thPh0i.png
I change the value to 100.
http://i.imgur.com/CpzXLFc.png
I then go to the game, switch to the hobbies tab, and back to the stats tab, to update the text (it won't update right away, make sure you switch off of the stats page and back to it). The multiplier is now 100.
http://i.imgur.com/zKHoFGB.png
You can keep editing it at this point if you want, I just used 100 as an example. Follow my previous advice about not setting it too high all at once, because if the completion time for a job or hobby gets too fast, it will crash.
edit: Also, if its not working, try setting the search to use rounding instead of truncating, since I've had resets where it was 2.65 and showed up as 2.7; searching 2.7 with truncating won't work, with rounding it will.
Float *1 just means leave the value unchanged (multiply it by 1). For some flash games, the value is saved as things like 4 bytes *8 + 6, which means you search for a 4 byte integer, and if the value you want is 100, you search for 100*8+6, which is 806. So I put *1 to make it clear its saved as the actual value, not in some sort of encoded format.